My bro hired 2 photogs for his wedding. One guy shot video, and some inexperienced 23-25 year old kid shot the photos with a Canon 350D and a telephoto and macro lens. Well, apparently, the man who was supposed to shoot photos went to do another wedding, and sent his son... and yes, he took the good camera, a 30D and prime lens etc. with him. Yes, his son watched his dad do it since 15. No, he was not professional. The photos were only good IMO.
Lesson is just make sure the photog you hire shows up unless there is a real good reason why cant, such as his death or alien abduction, death of parent, child, spouse, etc. If the man says he's booked another wedding and doesnt show up after signing a contract and getting deposit, sue him.