Hype. Hype is the number-one disappointment in gaming. You hype something and, by default, it will fall short of the mark.
Other than that, considering my expectations of games is incredibly low in general, nothing much to write home about.
EDIT
I mean, when a game has a bad ending, or when a game is bug-ridden and runs poorly, it's not disappointing because I expect those things; no game developer today with one or two rare exceptions releases quality product, they release beta-at-best and hope to make enough money to continue on to their next game, because the public will buy any crap that comes along so long as the right name is attached to it. Right now, as far as I can see, the three development houses that DON'T suck outright are DoubleFine, inXile, and Grasshopper, and even their products have plenty to be 'disappointed' about. (Psychonauts had the age-old camera/jump puzzle issue, The Bard's Tale abused that poor game engine to the point of some serious slowdown, and... OK, so maybe Suda-51 IS a god of video gaming who can do no wrong. Sue me.)
Post edited August 26, 2009 by Nimdok