So....I used to play Guild Wars all the time. I logged about 3,200 hours or so over 3 years. Anyone ever played that?
My favored classes both agree with and contradict what has been stated here. My favorite classes were the Mesmer, Warrior, and Assassin. Go figure, (Mage, Warrior, and Rogue, all in one.)
I suppose I should be specific. I liked using the Mesmer because you could set up to totally shut down one specific opposing build, or another opposing class. (You'd have to generalize then, and assume what they would do, but it worked most of the time.) This made me invaluable in dispensing bosses. (because I could cripple them beyond belief and deal armor-ignoring damage by exploiting weaknesses and interrupting spells.)
People usually hated me in PvP as well, because I would set up as anti-Caster or anti-Melee. I've had a few people cuss me out because of it. All in good fun, though, eh?
I liked the Warrior for three reasons... For one, he was the money-maker. I could farm with him, do runs, etc, to get gold. For two, I enjoyed being able to help people out as a Warrior, by providing tank skills (protecting weaker classes) and doing "hench-runs", where I'd take someone though an area without taxing them too much in terms of time, skills, energy, or cooperation. Thirdly, the Warriors had really sweet-looking swords. And I'm vain like that.
The Assassin I liked for almost the same reason I liked the Mesmer -- you could set up to do a quick-kill on whatever target you wanted. Grab some armor ignoring stuff, or some status effects, stack degeneration, and stab away. I would typically warp in, daze, knock down, inflict poison, deal damage, hit with signet, warp away, run to safety.
I also strongly preferred playing in PvE with AI-controlled allies known as Heroes (or Henchmen). I found most people to be either irritating, or hindering. My AI-controlled buddies would *always* listen to me. = )
Control freak, much?
So, perhaps type isn't so much related to the class itself, but how the class is played. I know many people who used the classes I used for different reasons. (Yes, all you loser Assassins that think you're a tank, this means you.)