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.
For me it was TLOU pt 1. I was so excited for it to come to PC, but it ended up being completely unplayable, and I wasn’t really a huge fan of the third-person cover-shooter gameplay. I played about 3 hours (and 4 hours of waiting on the menu) during the first week, and haven’t touched it since.