As far as gameplay goes you have dungeons, bosses, end-game (NG+ aka New Game Plus:
http://torchlight.wikia.com/wiki/New_Game_Plus), and farming. Then the skills are pretty diverse in the sense of creating numerous builds per class with 3 skill trees, similar to D2.
I really recommend getting it. The game is a blast and so addictive! You can get the demo on Steam, or you can get it here to see if you like it:
http://www.torchlight2game.com/. In the end though, the game is $20 and well worth it, too.
This post was edited by Beacon on Oct 6 2012 08:49am