There are two kinds I think that could produce candidates for this. Uninspired games and/or games with relentless microtransactions/DLC (Madden, Red Dead Redemption [liked the single-player, multiplayer is unplayable without DLC] and many Zynga 'games'), and games that I hate because I wanted to like them a lot more than I do. Mass Effect 3, for ruining the trilogy for me (SO MUCH ANTICIPATION), is the largest one. I am also disppointed generally by the Assassin's Creed series, rather disappointed at the most recent Armored Core for region locking, fake part variety, type-locked stats, tying fire rate to stability, and general other things, and I am a tiny bit bitter about how Dragon's Dogma allows you to do practically whatever you want all the way through the game and THEN tells you if you weren't pure warrior or sorceror since level 10, your build isn't worth a damn against the Ur-Dragon.