I've been playing it since I got in... very good to the most part, but there are some infuriating issues with the UI that are seriously getting in the way. The quickbar is next to useless apart from with spells, and the inventory is ghastly. You can't tell what your items are any more because all the icons are generic but tarted up with silly glows. Even at release the NWN1 systems were pretty much flawless, so it's disappointing. The combat animations look a bit artificial and it doesn't feel anywhere near as "smooth" as its predecessor. I'm sure most of these niggles will be fixed eventually though.
On the good side, the story so far seems on par with BG, the graphics are generally nice and the use of shaders for spell effects is awesome. The characters are rather well fleshed out and the interaction between them is very reminiscent of Black Isle's past work.