The only thing that really bothers me about Retronauts is the amount of speculation/conjecture. Bob Mackey seems to be the biggest culprit, while Jeremy and Ray try to reign him in. Generally.
I don't like to come down on the show, though, as all of them, and their guests, are pretty enthusiastic about classic games. And I really like listening to Jeremy, Bob, and Ray. Ray especially seems to have the most knowledge about non-mainstream stuff. But as Jeff said, I wish their knowledge of classic gaming went further beyond Nintendo. And I'm a pretty big Nintendo fan.