We all love our audio books- I know that I would be lost without mine! My commute is at least 45 minutes in rush hour traffic, and listening to audio books keeps me from losing it from all the crazy drivers out there!
I know there are some genres that aren't 'audio friendly' to some people, because they just don't translate as well for listening as it does reading. It loses its punch, so to speak. Now, there are some that are way better than the book, because it takes you there, and drops you right in the middle of all the characters. Sometimes hearing a soothing voice in a contemporary novel makes it easier to enjoy.