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.
The Legend of Zelda: Twilight Princess. It was so tedious to get through the opening area that by the time I got to the first dungeon I was getting tired of it. It did get better after that dungeon and the game opened up a lot more, but it one of my least favorite Zelda games.
I had forgotten how long the twilight princess opening is until I read your comment. I’ve played pretty much every Zelda game there is and tp is my favorite of all the 3D games, but man can that first part of the game be slow.
I’m playing Skyward Sword and the beginning also felt quite long. I just finished the first dungeon, which is way better than anything Breath of the Wild offered, so I’ll forgive the initial slow pacing.