Denman used to be great, but now his overplayed catchphrases are really annoying. If you listen to South African racecallers, some have very similar styles. What set Denman aside previously was that he had become more original and had his own style. Now, it seems like he relies more on annoying sayings rather than ability. If I hear "they would need to sprout wings to get to ______ today"...
But again, as others have mentioned, we all have our own opinion on what is good and bad, or what we like or don't like. I do agree that the Belmont in '04 is a much better example of how to call a champion getting beat. However, for me this is the standard for how to impartially call a national hero losing while keeping the race caller etiquette. Unlike Blame/Zenyatta, this was interjected with excitement and spine-tingling.
http://youtu.be/CTHZrdyta5o