We came to Butcher’s Dresden novels through the short lived series, the Dresden Files. I loved the series, and having read the books, I think they did a great job of casting. But there are things you can do in novels that you can’t do on television (limited budget and all).
The Dresden books are great dark urban fantasy pulpy fun. They make for great travel novels, making it easy to escape in to the world, but not being so complex that it is difficult to get back in to them after having to set them down for a minute.