My brother have played it since January. I have played a little during the weekends I've been in Växjö, but now that I'm home for the summer I'll probably play a little more. It's a good thing that I've got a job...
Lvl 35 gnome mage, btw.
I like the game, but there are bad things about it. Combat can be quite boring, even 'instant cast' spells has a delay of about 1.5-2 seconds. The combats in Diablo 2, for example, were more... intense. The reason for the delays is obvious though. Also, I think many quests are just "kill n creatures" or "collect n xs from that creature".
Now I'm off playing.