Well, this guy doesn't sound too intelligent, I'm afraid, (and extremely upset indeed) and I must admit that using TG requires some thinking. Same like buying an airplane, and expecting to do rolls and loops with it in no time; it just doesn't work that way. I've said this before; TG is too complicated to explain everything in simple straightforward samples, or written explanations, or node views. There's so many ways, and maybe not all perfect for each situation. It's a toolbox, not a click-and-render software. And that's a choice. But to go ranting like that is certainly a no-go, IMO.
It's also a one/two developer-business (Matt and Oshyan), afaik, not a huge organization, and given that, it's amazing what has been rolled out in the years past. I couldn't do it!