I have been part of the beta for a LONG time. It seemed fun but it really just seemed like a Diablo clone. I prefer new and innovative ideas (or at least a darn good storyline).
Well it's the same kind of dungeon RPG as Diablo, but it's got enough differences to be distinct. The currency system, the spells attached to gems (with a complex support system), not to mention the in depth skill tree, pvp, different leagues, races, etc. It's a fun game for theory crafters, which is something I enjoy.
I'm on onslaught playing an arc/summon witch.