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.
If Rare didn’t insanely exaggerate the collectathon thing before DK64, it’s definitely the game that completely fucking jumped the shark. It has as many kinds of collectables as other games has collectables in total. The Banjo games on 64 are good, but they pushed it a bit far, too.
Fun fact: DK64 is broken and was published that way. It contains a memory leak they couldn’t get rid of in time, which’ll eventually cause the game to crash. It requires the RAM expansion doohickey - not because it’s an engine requirement or for textures, like Majora’s Mask, but to stall the inevitable crash.
Apparently that glitch story isn’t true and they were already using the expansion pack during development. This video goes through all the difficulties the developers had while working on it.
Guess my game crashed for some unrelated reason after going un-rebooted for a while, then.