I'm not sure how it's in the spirit of Baldur's Gate except that it's a Bioware game. All their games seem the same to some degree. Combat is more tactical. The magic and skill system is vastly superior to any DnD game. I always hated that warriors had to wait for the mages to rest to re-memorize their spells in previous games. If you know the right spells, you might find mages to be overpowered.
Maybe it's also like BG in that it is dark. My wife probably wouldn't like to know that I'm playing a game where I'm talking to the demon possessed.
One of the biggest things, is that the people do seem very real. The world is very immersive.