I'm sure there are more, but I can't recall many "bad" games that I liked, but...
- Snake's Revenge for NES is generally not highly favored, partially because it's not canon. I found it to be enjoyable enough.
- Phantasy Star III on Genesis. Again, another non-canon title, and admittedly not as good as II or IV, but I liked it well enough. I really enjoyed the branching generations idea. Never-the-less, this is considered to be the black sheep of the series.
- Dracula X for SNES. I think people just dislike it because it's not Dracula X for PC Engine CD-ROM. Having played the CD version, I can say that it is vastly superior, but this game still isn't too shabby.
- Thunder Fox on Genesis - I don't know. It wasn't amazing, but I found it kind of fun. Previously, I had played the arcade version, which was superior, including a flying level if I remember correctly. This is probably the most "bad" of the games I have mentioned.

Yes after paying £45 and £20 for the RAM Pack on the N64 it was great. No it was shite. Romero can kiss my ass.

I don't like to call it a bad game, but it's considered by many butthurted fans as bad:
Prince of Persia: Warrior Within
If you look back at 2004 and 2005, the 3 greatest action game characters were Dante, Kratos and the Prince. For good reason:
A really complex combat system, the FreeFormFighting-System, and the Dahaka really brought Sands of Time to a new stage of awesomeness.
It wasn't funny or witty as SoT, but it sure was fun. And it had a good story aswell.

It was way more frustrating than Sands of Time, but I agree that the combat was much better. The Dahaka chases were probably my favorite part.
The story however was one big mess which didn't make the slightest sense.

Elaborate

Well, here's a bomb that I guarantee no one will recognise, but still worth a shot:
Mistmare, a game that is as tragic on the playability sector as it shines on the story department. Untill the 1.7 (!) patch, it was unplayable, but then you could at least put most technical issues on the side and get Isador, a fresh inquisitor from the papacy, to push back the dark fog that has engulfed half of europe. It's a fantasy RPG with a very original story, that I actually enjoyed playing through, but to tell the truth I might be biased (country of origin). If it had a mod community like most other games, it could become a real underground surprise. But alas..

Ricochet, the hl1 mod.
Yeah, it sucks so bad, but if you have a good group of friends who can have fun with it, you can really rock it out.

"There's a monster after me because I cheated death using the Sands. But if the Sands never existed, then the monster will have no reason to go after me!"
Now how does that make the slightest sense.
1. If the Sands never existed, he'd be dead (or at least a very different prince, which is the same as dying since a different person would be alive)
2. If 1 is not the case, then he would still have cheated death using time travel, and the Dahaka would still be after him.
After all, he had no clue that the Dahaka could be killed in any way.

I wouldn't go so far as call myself a PoP "fan", but I didn't like Warrior Within. I got all three in a Two Thrones pack-in deal, played Sands of Time, enjoyed it well enough and so fired up Warrior Within.
The first thing I noticed: it was emo as f*ck. But fine, whatever. New art direction and all that. Start the game. Loooong ass unskippable intro, with crappy metal guitar. Groan. Ok, now the fighting. What? You're starting me off with the worst part of the last one? Grrr. Wait, this fighting system is a little less frustrating... ok. Wait, what? You put me up against a boss that whips my ass before I've even really learned the controls? Oh, and the stupid metal bikini stuffed with gravity-defying boobies are always a great touch, way to class up the joint ::rolleyes::. Ok, let's try that again. Can't be that hard. Yeah yeah, blah blah unskippable intro again. Ass kicked again. Intro again, damn it, etc. etc. Repeat. Meh, I only paid 5-dolla for this game anyway. /uninstall
Maybe I didn't give it enough of a chance, but it sure seemed like a 'bad' game to me.

/spoiler (sort of?)
After Sands of Time, he wouldn't even know he ever opened them. The whole rewind thing, remember? I've never seen anyone complain about that... See, all this stuff is to be expected of a story with time-travel, and it has to be taken with a grain of salt for one to really enjoy it.
I don't understand it, and I never will: HOW was it emo? A bit goth-ish because of clothing of women in the game, especially shadee (but I love the style, so I'm ok with is even thou it looks weird.) Prince wasn't running around, crying "oh noooo, I am going to die, please, I don't want to die!", he was running around saying "I WILL save my butt and screw everyone who comes in my way." See, because that is how a desperate person usually acts. The script, the surroundigs, the music ... There was NOTHING emo about the game, really.
As a matter of fact, I loved music in Warrior Within, because it was different. Not too many games actually have some sweet metal tunes in them, ESPECIALLY not fantasy ones. I do agree that sands of time had a nice soundtrack, but Warrior within got me because it was different. And story made sense within boundaries set by Sands of Time.
If you found fights tough: Yes, they were. And you could restart on easy any time. Not to mention the first boss fight was pretty damn easy on normal as well, you just needed to learn to use block after not having to in Sands of Time.

Well, I suppose it's a matter of interpretation, really. For me it just seemed to hit all the right notes of black eyeliner and artfully arranged gothiness to signify cliched pain and suffering. For the brief time that I played, I didn't come away thinking "The Prince has been changed by his experiences" so much as "The designers changed the Prince to appeal to angsty teenagers".
Also, I admit the metal soundtrack is just my taste as well. I'm just not a fan of metal, and I guess I just don't understand the appeal.
Yeah, fair enough. I remember just trying to wall-flip things to death in SoT.
If nothing else, all this talk about it has inspired me to give the game another go.

Warrior Within wasn't a bad game, but it pales in comparison to Sands of Time. Also, I wouldn't describe the Prince from Warrior WIthin as emo, though he was definitely an ill conceived mesh of a bunch of things that were assumed to be badass. It's like a bunch of marketing douchebags tried to come with ideas for ways to make the prince into an action star and slapped a bunch of tough-guy cliches together thinking that would work.

Oh, i just remembered, i had some moderate fun playing GTA: San Andreas. And that game was bad. I mean, it had Guns N' Roses on an alternative rock station, ffs. The missions were dumb, the characters plain morons, controls were wonky, and i could swear it looked worse than Vice City. I actually finished the bloody thing, because i was tired of the quasi argument "you haven't finished it so you cant say it's bad". Well, i did, and it's even worse now. ;)

Heh, I will never understand why it got such a good reviews. I just couldn't keep playing more than a few hours. The only good thing about the game was it's size, and that's pretty much it I think.
Vice city, on the other hand ... THAT was loads of fun. Pinnacle of GTA series IMO.

I always preferred GTAIII over any of it's, er, standalone expansions. But Vice City had that thing in it. The atmosphere was right, the music was right, the clothes were right.. SanAn was so bland it hurt.
And yea, the size was nice, but then, it has a lot of countryland and 3 cities, which felt a bit small. I've felt it's a big world with nothing to do. There was a bunch of missions [and pretty dumb ones] like lowrider jumping to horrid music. Ugh, nowhere near the genius of "A SkunK In The Trink" from GTA3 [which was later redone in GTAIV, the only mission in which the trunk of a car could be opened and closed, dunno why]. I always saw SanAn as a rushed game created for a quick buck on the gangsta rap horror that was in at that time.
I hope they are not setting GTAV in the emo/werewolf environment. Wear one of the 218409238 tails and go pose around the school, reach respect of 65 and steal Your moms car. Yea...