For the most part Torchlight 2 is basically the first game with a few new classes, a better presented and interesting story, and, of course, multiplayer. Might not sound like much, but these are all awesome things to be additions to an already fantastic action-RPG franchise. The last announced class - the Berserker - is one of the best the franchise has to offer. The Berserker's combat tropes really compliment the games 'keep you in the action' motto. Torchlight does many things to keep you exploring and slaughtering foes, like having a pet that can run items back to town for selling when you're getting full and they can also be told a shopping list as to return with potions and scrolls if you need them.
The Berserker's combat style encourages this go-kill-go gameplay by having a frenzy meter. The meter dissipates when you're not attacking something and when it fills, you go into a murderous critical strike-fest. Not only do you have basically a 100% crit-rate for a period of time, but many of the Berserker's skill tree enhancements are influenced by critical strikes. So, the ability to heal yourself for a percentage of the damage done on a critical or any other assortment of critical related skills make you want to utilize your frenzy to its best potential. The Berserker's combat abilities really make you want to go at a fast pace and kill everything in sight as fast as possible.
Check out some of the Berserker combat.