Having played as an Archer on last couple of servers, warriors are awfully boring and costly here until 62+, i hope... when you finally get another skill after half moon and blood cleaver. im 54 and havent got blood cleaver.
On the whole, on average it does look well balanced.
Wiz mass kill quicker with firebang/fwall... so will speed off levelling wise.
Sins kill quick but very squishy.
Taos good early on, less effective solo as they get higher as mobs get harder and pets less effective. No real damaging spell but tbh thats how it should be as they are a support class - definitely feel they are worth their weight here though, everyone wants a good tao with em.
Warrior, good HP pool, can take a battering compared to others. Bit boring, should be half decent end game.
I dont think there is anyone class which can kill lots of subs solo (til higher level) something valk i think wanted to encourage group play.