Torchlight is a diablo-like game where you pick one of 3 classes to delve into dungeons, level up your character, collect treasures, and manage your inventory.
One thing I like about Torchlight is the pet. Your pet not only helps you in battle sometimes, it can also be sent back to town to sell your junk items allowing you to go deeper into the crypts without needing to use a bunch of teleport scrolls every few minutes.
One thing I don't like about Torchlight is some of the 'informational' UI screens. For instance, I caught a fish and after sitting around for a few minutes trying to figure out how fishing worked, I was expecting a bit more fanfare when I reeled it in.