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.
I thought the same about BotW. Between the lack of story by default (you have to search it out through specific pictures that you damn well be able to know the landscape and match it up) and the sparse music and themes of previous Zelda games. It felt like the SMB2 of Zelda games, you could have titled it something else with a different protagonist and it would have been its own game.