This may very well be the best game I have ever played. At least since the Baldur's Gate series.
The only gripes I have about this game are about length, one boss fight and bugs. During Chapters 2 and 3, my quests seemed to come, rapid-fire, one after the other. This isn't something I can really hold against the game, as it was my choice to pursue the alternative quests. But then again, without having done those quests, and thus leveling up my character in the process, I wonder if the game would have been too difficult to defeat. The boss fight at the end of Chapter 1 is definitely too difficult. Posts litter websites saying so, and the developers could have easily hinted how to defeat the monster. Once you know how, the fight is simple. Last, even after several patches, there are still game-breaking bugs. I found myself having to replay through Chapter 1 and half of Chapter 2 when encountering a bug that stopped my progress.
Definitely worth getting if you're a fan of RPGs, Action RPGs, or simply own a PC that will run this game.