I got tired of GW, I stopped at level 17, none of my friends were playin' it so I uninstalled it.
Never heard of specialists, though I did play some Day of Defeat and Natural Selection back when. Gunz I got into for awhile, but then once you get up into the higher levels, everybody has machine guns and with it I feel like a lot of actualy skill required to win is lost. BF2 is definitely a system hog, you need a gig of RAM and a good 256 to run it well. Same with Elder Scrolls: Oblivion.
I used to play nothin' but consoles, but the only thing I've played on my Xbox recently is Ninja Gaiden.