Personally there are a few games which left me very dissappointed, after hyping myself up for years in certain cases.
Divinity Original Sin: turns out I prefer more streamlined, less packed games (love Pillars of Eternity) and that coop play in a CRPG stresses me out.
Wasteland 2: I actually managed to finish this one but secretly I admit I was hoping for a better Fallout which I didn’t really get. New Vegas did the cowboy theme much better.
INSIDE: while the design was cool, it was just a ton of boring, easy puzzles in comparison to LIMBO, its predecessor.
Elden Ring
It’s just Dark Souls 3.5. Which is not necessarily bad if you really liked DS3 and just want more of the same thing, but I considered DS3 by far the weakest in the series to begin with, and playing the Nioh series after it has opened my eyes to just how much room for improvement there is in the DS series as a whole. From Soft has basically followed the same path as Bethesda - they used to make varied games until one of them randomly became wildly successful, and from that point onward they haven’t had the balls to deviate from the winning formula and have just been remaking that same game over and over with a slightly different coat of paint each time. Which makes sense from a business point of view, I guess, but after this many repetitions, it’s become clear to me From Soft is totally creatively bankrupt. Hell, it’s been more than a decade since Demon’s Souls, and they still can’t even figure out a better counter to the “roll behind them and stab them in the butt” strategy than making enemy tracking ever more effective and their movements ever more spasmodic and unreadable in each subsequent game. The end result of this complete lack of willingness and/or ability to innovate is that despite being expertly crafted, Elden Ring feels very by-the-numbers and utterly soulless (if you’ll pardon the pun).