Two Worlds 2 is a great step up from the first game. It has good voice acting, some interesting side quests, lots of exploring, lots of combat and a great magic system. The weakest part is actually the main story.. It's not badly written or anything, but it just hasn't gripped me. In fact, I forgot why I am in the world at all! Right now I am only going forward because of the quest log, not because I want to know what happens next.
It's still a very fun game though, with some interesting characters to meet along the way, lots of interesting places to see and it is fun trying to find better equipment for your character. I'd say it's definitely worth a purchase, if you like open world RPG's.