Very early comments, so take these with a grain of salt...
So far, Baldur's Gate (the original) seems a fair comparison but the 3D engine still makes is feel more NWN2, to me. It definitely doesn't have the originality, vision or philosophical weight of PS:T (but little does), so get that out of the way. Not as combat heavy as IWD, but the art and music aren't as striking, either.
Unlike NWN2, it has a really nice interface and the game doesn't generally get in the way - but like NWN2, it lacks formations and I haven't quite found the same tactical balance as the IE games. The rules (what I can decipher) seem more balanced and interesting than D&D -- it's really nice to have something different.
It feels a little whimsical - I rather like the "dark and gritty" setting of The Witcher or the more complex writing of Black Isle / Obsidian but this works nicely as a straight-up fantasy adventure that ends up feeling different, despite the rather cliche tropes.