4. Counter-Strike
Though Call of Duty might take home the lion's share of the bacon these days, Counter-Strike remains the inaugural, big-game online FPS title, and even in light of CoD's popularity, still has a vibrant online community. It's a shame, then, that so many members of this community are needlessly angry douchebags, smashing their keyboards seemingly long and hard enough that they just about manage to string together what might by primitive human standards be called a sentence. Overuse of terms like "scrub" also prove frustrating, exacerbated by the fact it's usually used for petty reasons, such as killing someone with a body shot rather than a head shot, or as above, not knowing the best spots to camp (because camping's classy, guys). Also the game has some of the worst losers I've ever played with in any game; get the clean, efficient drop on an enemy, and expect to be called out for using "hax", with the downed foe calling for you to be "banz0red" by an admin. Players can also be oddly cliquey, banding together to vote-ban you if one player starts throwing a hissy fit because he wasn't good enough to take you down before you went in for the kill.