Torchlight was the worst purchase I've made next to Mistmare or recently Magic the Gathering (horrible money grab game). GT1 was a lot of fun. Not the best game out there, but it had enough to keep me interested in it till the end.

I bought GT2, but I haven't played more than a minute of it so I don't really have an opinion on it one way or the other. It's on my list to play after I get through a few others.