I'm no expert on drakensang, I've only tried river of time on a friend's computer once for about an hour. It was well made, the graphics were good, but I don't recall how much of a voice over it had. I think it's underrrated because the developer for the game is not a big company so it doesn't see much advertising to make it sell well and then procure a better budget for the next game so they can do better voice overs. As far as the story goes, I believe it's based on some books, which are very good from what I've heard. Again, I personally haven't read/played any of them in length, but if you're looking for RPGs with squad based system ala NWN then it might a good series to poke at