While it has technical issues, it also posses story that will certainly suck you in.
In game graphic is nice, it's not very realistic but since this is D&D game realism isn't that important. Combat, while not innovative is quite enjoyable. It doesn't require you to manage every party member during combat because of decent AI. While you can still do it, in most fights it isn't really necessary.
Story is great, it starts slow but soon escalates to classic battle to save the realm.
Companions are very good, they are interesting and you will surely like at least one of them.
Only downside in game are bugs and bad ending.
Even with Mask of Betrayer expansion and the last patch there are some really annoying bugs.
I won't talk about bad ending because it would be spoiler.
It's great game, if you liked Baldur's Gate you will definitely like Neverwinter Nights 2.