I had it on PS3 and found nothing wrong with it. I had a ton of fun playing it.
There are some bugs, but since I'm a fan of the genre I let them slip. PC version might be a better investment if you have a good computer. Otherwise if you're thinking of getting it on PS3 get it.
I never noticed a drop in framerate, even with 2 huge aoe spells and a ton of people to kill. The only problem would be low quality textures in some places.
Also, the graphics might be disappointing at first, but they really grew on me. You do control a group with responsive controls, fighting armies of badguys. I think the game play and story make up for the graphics (which I did end up liking a lot anyway).