While I'm only level 20, I'm really enjoying the game. It's definitely worth a look in.
What I don't like is how poorly it runs on my system (late 2013 15" rMBP w/750m). I get anything ranging from 8-30 fps (average is about 18fps) with everything on low (and things like shadows off). I know I don't have a gaming powerhouse but with everything on low it shouldn't really drop below 30fps.
It's so poorly optimised at the moment, it's pot luck as to whether it will run well. Some brand new high spec desktops are struggling with keeping 30fps, some old school c2d (with equally as old GPUs) are getting 60fps on ultra.