1. ToS is my favorite to play (big surprise there,) because of the challenge of playing multiple roles at once in PvP combat. I also like the "living on the edge" aspect of playing a light armored class that typically has to stay close to the front line to be most effective.
2. Bear is my 2nd favorite, because the mix of spells & melee is a lot of fun for me. Plus, I don't have to constantly twist my old fingers to do 2 & 3 step combos. The BS would probably be my favorite if it had a bit more burst DPS, but its tankiness sort of makes up for that, I suppose.
3. Barbarian looks like a lot of fun because of its speed & versatility and is my biggest contender for 3rd favorite class.
None of the other classes really stand out for me but I'd have to put the ranger as dead last, because it's the easiest class to play selfishly in PvP. I think the way it's currently configured doesn't add much to any group in mini-games, except to steal kills with TTS. It's a class that SHOULD get focused a lot, but rarely is, because of the ridiculously over-the-top & endless CC's.