I've played in the beta 5, got to lvl 17 on a mage, and so far my impressions are mixed. The core of the game isn't much different from any other MMO out there, the quests have a generic feel, etc..
But i'm still curious about this game. Maybe because i've only played it for a day. The public quests are interesting at first, but get old quickly. Let's just say that after you've done the same rift/invasion/etc.. 3-4 times in a couple hours, you get a feeling of the futility of your actions. I still havent touched the crafing system except for some very low level mining, but i heard it wasnt great.
My main complaint about the game would be the fact that you get aggroed easily when moving around for your quests, and since i'm a squishy mage, i can't really ignore it and have to fight lots of useless battles. Also, If you die, you have a fair chance of being aggroed when you repop near you body (because you can't see where mobs are), and to die again because you'll have only half HP and no buffs (and in my case, no earth elemental bodyguard).
Anyway, i think i'll go play some more, since the beta 5 will only last a couple days. But i honestly don't know if i'll be interested in playing it again when it goes live.