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.
While I am currently enjoying the hell out of this game, I don’t know why it took 6(?) years for this to come out. The sky stuff isnt that expansive, the depths are pretty basic, and the main world isn’t changed all that much.
After about 50 hours I realized that I was only going to play this game once, so I better try and get the most out of it.