I've seen him just a handful of times. He's dead on sometimes and just as absurd other times. I saw him inspect a house with really obvious plumbing and electrical defects and if the inspector missed them, then he did drop the ball because they were plain as day. The problem was they never actually showed the notes from the report or even read a few of them on air. He just asked the owners if "they were told about this", and of course they claimed they weren't. I know there are bad inspectors out there, but the law of averages makes it pretty obvious that there are WAY more irresponsible clients who 1)don't read the report fully or at all, 2)read the report and don't follow up on what they don't understand, 3)read the report and understand it all but they choose not to do anything, or 4) don't read the contract so their expectations are beyond human ability.(or they watch Holmes and he feeds their unrealistic expectations)
It doesn't really matter which of those they do, when something breaks they start looking to blame someone. Interestingly, that is one of Holmes' favorite rants, "nobody wants to accept blame or admit they did it wrong". He's right, including home owners/clients. Like Bruce said, he does back up the inspector every once in a while, but I'm sure the producers edit that out as much as possible. TV would be boring if there wasn't some conflict. I just wish the show called out every party involved equally. Get the sellers, the buyer, the agents, the inspector, get all of them in there and have a Trump style boardroom where the truly offending parties are dressed down on national TV but are also given the chance to defend themselves. I doubt the home inspectors will come away taking the prize for "biggest idiot" the majority of the time.