Fun game. Absolutely no originality as it has borrowed everything from WoW and Diablo (Runic is full of people who worked on Diablo, so it's understandable I guess.) I actually really like Warcraft's graphical style, so seeing it prettied up in Torchlight is cool. Loot whoring has never been so much fun.
Ah ya, and those two games borrowed from 2 other games and so on.... BLIZZARD doesnt have an original IP in the lot, every game they have made is a rehash of someody elses idea (but i must admit they do it far better then most (copy)).
Torchlight is made by the team (members of) that did Mythos, who also has the guy who did FATE.. which was a copycat of Diablo which was a copy of... you get the picture...and yes ex Blizzard people too.
As for originality.. i dont recall guns in Diablo.. Originality, never be any in games, its all been done before.. but ingenuity... now that is the key.
Torchlight never ends, goes on forever, so for $5 you get a clone game with new graphics, different classes (although the same, they all shoot or bash). that you can play, well till you are sick of it. Not a bad deal for those who like that kind of gameplay.