Right then, performance is terrible, there is definitely something wrong, I get the same fps on extra low as I do on ultra high, and that is sub 20fps in most places, the classes seem well done, no complaints there, and the progression system is pretty clever, im not sure about letting everyone be 3 classes though, can't help feeling it'll just lead to everyone being able to do everything...
Questing is your standard MMO fare, certainly no innovations here (except a fairly cool aoe looting function), but they were never suggesting there would be.
In terms of the rifts, I've seen a few, but it's been hard to judge them really, largely due to the fact that as soon as one opens, several hunderd (no joke) people run over to look around, however, they do seem to be near identical to WAR's public quests, but without the story elements, I think these will depend on how they work come release with lower player densities, apparently they can move around, and attack towns and stuff, not seen anything like that yet myself, they seem pretty gimmicky thus far.
I'm interested in the pvp mainly, it seems to be the only thing coming up with decent rvr combat besides GW2, so i'm hopeful that it works out well. Basically,
tl;dr
Very polished, not very revoluntionary and right now, performs like utter crap.