Is there a game that you've been very patient for, which turned out to be dissappointing when you finally started playing it?
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.
Supreme Commander 2. Threw out all the things I respected from the first game and swapped in a bunch of trendy bullshit that I did not. A crushing disappointment.