I think he's not too bad.
I've not heard him state anything untrue about the reptiles he talks about. Yes, he might set up some shots, and its bloomin' obvious he does- but it adds to the excitement of it especially for kids- my daughter likes watching him. It doesn't matter what 'wildlife' people they put on telly- there will be someone who thinks they're a poser, or a tosser, or some other derogatory thing.
I don't see anyone else offering to go to Africa, or climb a mexican Mesa to find a snake....don't talk shyte if you aren't prepared to do it, just because he's out there doing it.