I could only see the first half on TV, and actually have considered Aikman to be serviceable as a color man, but was struck by how stiff Aikman was on the subject of Gailey. Very early in the game. Brenneman lofted a softball about how Gailey had coached Aikman in Dallas and took them to the playoffs twice, and all Aikman could say in response was: "Yeah, but we did not win a playoff game under him, and he didn't last much longer after that." Nothing in that statement is untrue, but it really struck me as ungracious, as if Aikman was unable to say something bitter, at least to start.
On the other hand, I do agree with earlier posters who noted that announcers are front-runners. This is especially true of national announcers, since their actual knowledge of the teams they are presenting is quite thin and based on obvious talking points. Once it is clear that one team is dominating, they can quickly shift into "everything they do is great" mode.
That being said, I would consider Aikman's early comments more of a reflection of his actual feelings and thoughts, and it would not surprise me if he was told to dial that back over the course of the game.