I wouldn't go anywhere near that far, but I think all three of them are much the same: they all are egomaniacs, and they are are pretty miserable people.
O'Reilly thinks if he can act smug enough, he can get people to think he's intelligent. This is the same thing as Paul Begala thinking if he talks fast enough, people will think he's intelligent. Both are idiots who, without the bombastic use of their voice to drown out the competition, couldn't whip a paper bag in a fair debate.