So far I've tried Warrior, Archer, Berserker, Slayer, Mystic, and Sorcerer.
Archer is ridiculously easy to play. I didn't like Sorcerer or Mystic. Slayer was fun, but a little too slow for me (not necessarily speed of swings, but the ability to keep hitting a mob for staggers). Warrior was a nice speed, but I was much less interested in the skills than with Slayer. Berseker I accidentally skipped the Prologue, so I just tested combat speed and glanced at tooltips. Don't think it's for me.
Still need to try Lancer and Priest. But, as of right now, if I buy the game I'd probably go Slayer.
Anyways, you all are horrible, @#%^ed up people
Never underestimate the healing power of a massive dong.