I played a lot when it first came out, but really once the difficulty ramped up I lost interest. I couldn't solo anything anymore, and my schedule rarely synched up with my friends, so I couldn't really advance any more without farming gear for weeks on end. No thanks...
I also played Torchlight 2, which I actually prefer. And it's cheaper. And doesn't require an internet connection lol. And none of that real money auction house nonsense.
Pretty good for a game that's almost a straight up copy! They actually improved a lot of aspects IMHO.
_Nerd