Definitely agree when it comes to PlanetSide 2, even though I suck at it. It also has monstrous system requirements. I guess Battlefield 3 would be a more casual alternative.
By the way, how many people still play the first Modern Warfare game on the PC? I'd be glad to play some casual rounds, but if only expert players are left I probably won't even bother with installing it, this game tended to be tough right after the release so I guess that if only die-hard fans are left the skill necessary to get some kills would be pretty high. Anyway, that's just speculation on my part, but I'd be glad if you could give me some answers