I've seen Denny fly and I can honestly say it was one of the best displays I've ever seen. The ribbon cut is awesome, and the general interaction between himself and the audience makes the display more entertaining (through the self-commentary). His maneuvres may not be spot on to a critical eye (I don't know) but his displays are certainly exciting and this is what the public wants, and if the public is happy than surely this makes it easier for all of us involved in aviation.
Just my thoughts!