I play on 'hard', I enjoy the combat for what it is. I like it better than most combat systems out there however I'm extremely jaded in that area. My current measuring stick is Severance: Blade of Darkness, there simply hasn't been a better combat system made to date, IMHO. So, while playing games such as The Witcher, I usually cut them some slack since they have so many aspects of the game to focus on including the combat system. As long as they make a reasonable attempt, which I believe CD Projekt Red has done, at a decent, enjoyable, combat system *and* have a worthwhile storyline, atmosphere, etc. I'm good.
That said, and as a 'twitch', I think it's one of the better games I've played in awhile regarding combat. I felt like a witching machine when I stun killed the Beast, and proceeded to bathe in the blood of my foes well into chapter two without a hitch. I could definitely see the rewards of my hard earned, and well spent, attributes as well as proper use of potions, lore, and blade coatings.
Just my opinion, of course.