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.
Master of Orion 3 Played 1 and 2 all the time as a kid with my brother and my father. We were SO hyped that there was going to be a MOO3 and we bought it blind because that’s what you did back then. We were in for a massive disappointment. They had some good intentions to reduce Mikromanagement but we never understood how to really play it. We tried it again after a while but came to the same conclusion