First, I am a little bit surprised to see this game here. It is not what anyone would call a good old game. Well, it is not old - except you are a graphic whore who finds games from last year to be old but chances are, being a member of GOG, that this is not the case.
The game itself is actually pretty good - in its patched form. Yes, I know that there are some really bad reviews out there but I am certain that most of them are about the unpatched retail version.
If you like free roaming RPGs then you will not be disappointed (except perhaps by the awful voice acting).
The only thing really disappointing is the fact, that there are so many great old games that I was hoping to see on GOG and Two Worlds (like some other games on GOG), in my opinion, just does not fit in.