TheDudeLebowski: Riven is definitely on my 2021 playlist (never played it). Adventuregamers.com is quite favorable towards Myst III and IV. When you say inferior, in what way? (Haven't played them, but they're on my wishlist).
my name is sadde catte: 3 and 4 are very good considering they're by other developers, they're just not Riven...
I couldn't say it better than our sadde catte!
Once you play Riven you will understand the feeling. Everything in this game feels so... majestic and perfect!
Don't get me wrong, I also love Myst 3 and 4 (and 5 - see below). These are great games as well. I mentioned "inferior" mostly because I couldn't get the same feeling as in every step I took in Riven. All of the Myst series is great, but Riven stands proudly on top :)
my name is sadde catte: ...
Don't forget Uru! Myst 5 doesn't make a lot of sense without it. Myst 1-4 are all actually set some time in the 1800s where Myst 5 is implied to be later than Uru.
I kind of always thought of Uru as an outsider in the series, I know it sounds negative but I could not feel very attached to the game. I could get used to playing a Myst 3rd person game, with simplistic 3D platformer controls, but I think the whole "find the signs" sounded to me like "gotta catch 'em all" :) I know it may sound stupid, but it wouldn't let me feel the same thing I felt with the rest of the series.
I honestly don't know if Uru will be part of the marathon, we will have to think a bit.
Myst 5 is a tricky one to describe. In general, I liked it. But I think I made the mistake back then to play it in free-roaming mode, so it felt more like a generic FPS with puzzles. This time we will definitely play it in point-n-click mode (thankfully there is an option).
Also, @TheDudeLebowski, in Myst 5 there is a new machanic which can be hit or miss depending on your tastes (please note that the following info is not a spoiler, it is a core element after a while in the game) - you get a stone tablet on which you can "draw" stuff to achieve... other stuff. This can sometimes be fun, other times frustrating until you get it right.