Is Steve Bunce the guy that is always speaking much louder than necessary? If so, yes, he is very annoying.
The only British commentators I know of that I like are Jim Watt and Lennox Lewis. The only American ones I like are Jim Lampley, Larry Merchant, George Foreman, Emmanuel Stewart, Bob Sheridan and Al Bernstein. Here in Australia, we don't have a single good commentator.
I've noticed British commentators generally don't like the Klitschkos. This isn't because of Wladimir beating Haye either, because the negative commentary precedes that. I personally think it's because they don't like someone from the continent beating their fighters (Lewis is the only UK fighter to beat a Klitschko, and it was a victory with an unsatisfactory finish). I think these commentators would be much more comfortable with an American fighter beating all their fighters.
The worst commentary crew was Al Marvin, Ferdie Pacheco, and Bobby Czyz. Al had a good voice but has no boxing knowledge whatsoever. Ferdie Pacheco was the most miserable guy on the face of the earth; he was the most negative person I ever heard. Bobby Czyz was actually quite good.