To be fair this port's controls work way better (and were originally meant) for xbox360 controllers, so if you have a usb controller, it will be a lot easier.
The graphics are somewhat better, considering it's a cell shaded game, there isn't much to improve, the textures were updated for higher resolutions and they managed to license 27 out of the 32 original songs, not to mention all the bonus content included and some songs from Jet Set Radio Future.
I don't even have to say it's worth it, this game is freaking awesome, best port to pc I've seen in a long time.

If you like diablo-esque dungeon crawlers with online multiplayer and AMAZING gameplay, you're in for a good time with torchlight 2. great graphics, really good story, decent music, overall FUN gameplay. Definately a must buy

HEY FAGGOT, DO YOU LIKE SHOOTING PEOPLE? YOU DO? NOW? DO YOU LIKE THE GRAPHICS ON THE CRYENGINE 3? YOU DO TOO? WELL DO YOU LIKE SHOOTING THINGS WITH THE CRY ENGINE 3 WHILE A FUCKTON OF SHIT IS GOING ON THE SCREEN AND THE MOST FAST PACED COMBAT HAPPESN RIGHT BEFORE YOUR EYES? THEN GET THIS GAME FUCKER! IT'S AWESOME