Finished this game an hour ago...
I think i can safely say this game is all i wished the dragon age would have been, but failed.
1- It treats a player as a mature being: sex and violence are realistically portrayed, people swear and generally act like an assholes, like in real people tend to.
2- characters are developed and believable: i found myself really hating more than one npc and actually looked forward to kill them. that didn't happen in a LONG time. characters in general are not saints or devils, and often it's the circumstance or greater goal that dictates your interaction. very very few npcs behave like their sole purpose is to deliver their exact and expected lines, in order to present us with the general idea of their (caricatured) role. their "occupation" (king, peasant, elf) is a part of them, not the whole of them.
3-story is good: while there is still some world threatening stuff going on and amnesia as plot device, it was well developed IMO. choices are even better, there is no good or bad, consequences come much later in the game.
4- appropriate graphics: although witcher is total eye candy, i'm not talking about that. details that make the world feel alive and diverse, like characters having their individual faces (no 300 generic peasants, and they actually bothered to make various age-related models. no more old ladies with the bodies of a 20 yers old girls)
5- combat: is hard. at one point i switched to easy and slaughtered my way through. i imagine a lot of people that want challenge will find here what they want, but if you like your battles easy, that can be arranged too.
all in all, i am very impressed with the relative maturity of this title. i really felt all the dirt of "fantasy middle ages", not to mention rampant prejudice and brutality. i was highly skeptical before, but if someone asks again, no, i don't want to live in a fantasy setting, despite of dragons and magic :P
bottom line- if anyone cares, i recommend this title.