Dead Space: It really just didn't scare me, and the shooter behind the alien pop-up faces wasn't all that entertaining, and seemed to rely on the awkwardly absent suspense of the game. Not to mention the port was crappy.
MOBA games: I just really can't get into them, I don't understand them at all. It always seems like diablo 2 PVP with a bunch of random crap thrown on top of it to make it competitive.
Every Castlevania Game since "Symphony of the Night": They just lost their great gameplay style. What was once a game about planning your attacks carefully became a game about grinding and backtracking.