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.
Ironically, this is my “I don’t get why everyone is so disappointed in it” game. I have more played hours in Fallout 4 and Skyrim than I do any of the earlier games in either franchise. Don’t know why, and it’s not that I came into them recently. I have nostalgia for the others, but I just can’t be bothered playing spreadsheet simulator even against Mr. House.
With F4, I know I can dream a build and it happens, even if as I reach higher levels the builds start to blend a bit.
Also, I used to work in the Institute Building, which is placed on the squashed Boston map NOT at MIT, but at the office complex called the Arsenal.