For warriors, you can go WreckedShip from lvl 22 onwards id say, purely for the DC required to do damage.
You can also lvl there for free. Kite them using thrust, they die quicker than if you were hitting normally and the mobs are so damned slow they never hit you.
Im now going without pots and just staying until my bag is full of **** to sell.
Tao's too apparently find this easy now, watched a <26 tao tonight just psn killing 20+ at a time, taking like a minute. Rinsing exp
Really hope this place wasnt known to the small few who got to test before launch, and no open beta limited everyone else's knowledge. Pretty big headstart for some.