So far my time with Witcher II has not been a pleasant one. I'm forced to play in windowed mode because fullscreen eats performance like mad, my other machine just runs at a crawl to begin with (both strong machines, and no matter how I change the options). A patch is apparently in the making, but it adds that the downloader in the launcher is notoriously buggy itself, too. Ignoring bugs for a moment, and ignoring some quirks of the combat system (which are, again, likely bugs), I am impressed with Witcher II. It's presentation is very well done, the game is absolutely stunning at higher details. Minor choices do come back as - minor - results later on, the gameplay is interesting and - luckily - actually fairly difficult, and the story seems interesting from what I've seen so far. The only criticism I could level against the actual design of the game is that the Witcher's neutrality has been shoved away entirely. There is rarely a way to stay out of something, now.
