Yeah, Witcher 2 is a decent game but it's so small, linear, and limited compared to Skyrim. Totally different experience really, I have a hard time getting immersed in a game where you're funneled down paths, even literally - when I can't jump, and can't wander far off the beaten path I just keep getting reminded that I can't really do anything I want, I have to do things they want me to do in the Witcher.
Honestly, I was a tiny bit underwhelmed in the first hour or so of Skyrim, and then I felt really stupid for being underwhelmed shortly after that :P. The game is probably the best game I've ever played for a full price "AAA" title. For once I don't regret paying full price for a game, there's a crapton of entertainment for the money.