The Greek guy with the crazy hair just annoys the living heck out of me. Just because something is a complex unknown doesn't mean aliens were involved. I watch the program only very occasionally and then only if I'm just too mentally wiped to do something useful. Sometimes I have it on in the background when I'm grooming the dog. That's pretty much it.
I thought the first season was pretty good. The problem though is that they exhausted all of the best evidence supportive of the ancient astronaut hypothesis in that season, and now they have to reach pretty far to have a show. Even the successive seasons have some interesting historical information though, even if some of the conclusions regarding that information are wildly speculative.
And you gotta love Georgio Tsoukalos. That guy cracks me up. He's like a much more entertaining version of Bill Birnes.