I'll say upfront that that I'm enjoying the game so far, but it's a mixed bag.
Writing quality is very inconsistent. Many facepalm moments, typical Bioware melodram that's trying too hard to be mature and serious but comes off as juvenile and laughable, predictable "archetype" NPCs with nothing worthwhile to say. But it has its rare moments of glory, like the "Connor situation" which offers several distinct resolutions, including a satisfying bargain with the demon. Or the witch Flemeth who is generally well written and has a rather interesting relationship with her daughter, again with multiple solutions how to handle the situation.
Basically you have to sift through a lot of crap to find the occasional gem.
Graphics are pretty bland and dated for the most part, but some indoor areas look decent in the isometric view at max zoom, almost like IE games of old but not quite as detailed. Unfortunately the game is unplayable in that view alone as you have to rotate the camera to look behind walls and corners so you are bound to constantly switch back and forth to the OTS camera. And then there's the gore, rivaling the worst splatter films, which isn't that noticeable in isometric but looks ridiculous when the camera switches to a closeup during dialogue, the characters dripping with blood while joking around and smiling retardedly.
Combat is actually pretty fun and rather involved compared to, say, NWN2, but I'm playing on hard with friendly fire enabled for aoe spells so there is at least some tactic required rather than dropping fireballs in the middle of the clusterfuck of friend and foe. Difficulty seems to depend a lot on party synergy. My standard group consisting of PC mage specialized in the primal tree, sword & board tank (Allister), entropy mage (Morrigan), archer rogue/bard (Imoen) is generally doing fairly well, but the lack of a dedicated healer means I have to reload now and then when I'm too careless/don't kill stuff fast enough. I replaced the gimp rogue with Wynneh (spirit healer) for a while while doing the Mage Tower liberation and it was a breeze in comparison. Overall it's not exactly hard with some preknowledge of MMO game mechanics but not trivial either. And there is always the nightmare difficulty for another playthrough with an optimized party.
Would post more thoughts, particularly about character development and world design, but I rather go play the game now. It doesn't grip me in a way that The Witcher did, but so far it's interesting enough to keep me playing. Might even be worth the money if it can hold my attention all the way through.