It's all well easy to judge other people's hobbies when you're well overpaid to try sports cars and make a bit of humorous banter for a living.
I found his books (never bought one, but from what I've read by the shelf at WHS) rather boring and useless.
He reminds me of Chris Moyles, very opinionated pontificator, but still the funniest/most interesting parts of their shows is when their sidekicks speak.
But hey, he's entitled to his opinion just like we are entitled not to listen to / read what he has to say.