I would never play an Assassin Creed title, I gave AC II a shot back in the day, got really bored, really quick, I've never had any interest to play any of them since.
Same as above applies to Final Fantasy series, Japan anime, or JRPG's just do not appeal to me.
There are tons of games or rather more accurately many genres I just can't get into for the life of me.
The only competitive online game I play is SFIV (USFIV) I guess I would play SFV as well if I had a capable PC or a PS4.
The only other online competitive game I spend many hours playing was Uncharted 2 multiplayer.
I can never play Call of Duty or Battlefield types of games online, although I do enjoy the single player campaign modes of those games... no matter how short or/and crappy.
Mostly MMOs, RTS', JRPGs, Anime inspired games and such, and lot of the PC titles in the spirit of Kerbal S.P. Tower Defense, God (build your world), Sim series etc. Would never play... I guess you can argue I am "casual" gamer, but I have beaten all the Fallout games since Fallout 3, all the GTA games since GTA3, All the Resident Evil games from one to 5 .. I don't want to touch 6 with a ten foot pole... I always like to see games to the end (ones that do have an ending) And I always like to play games on the hardest difficulty.. unless there's "crushing".
And yeah.. I probably put in like 10,000 hours in SFIV online.