I'm not sure. MMOs were my uber-game back when I was like 12, but I never got the chance to play due to having no money at the time. Perhaps I missed the train because of that. They strike me as so incredibly boring these days. Now, a good single player or small scale RPG on the other hand is ok. I'm just not as much of a gamer as I used to be in general though. Somewhere around the 45th WW2 shooter or 38th C&C clone I stopped getting much of a thrill out of essentially paying for and playing the same thing I've already played by a different title.
There are some exceptions: Well-done, story-driven games still give me a real thrill. Some other oddballs do, too. I enjoyed Crysis, all of the HL2 games, Portal, TF2, Max Payne series, Company of Heroes, Supreme Commander, Saints' Row 2, and some browser based games as well.
BC2 is an incredible experience in DX11 mode using eyefinity. You really should experience it. It has some major multiplayer balance problems, however. Singleplayer for Modern Warfare 2 was great on eyefinity too. I actually waited to start playing that game a few weeks while I acquired the extra monitors and Radeon 5850.