I love it when drummers go nuts, Willie. For example, the Police's last show at Shea stadium in 1986 involved Sting singing with broken ribs because Stewart Copeland punched him in the stomach moments before the performance. I have no idea if it enhances the music, but what the hell.
Zep was definitely a blues band, Smartt, and they did it well, but I prefer the original stuff to the British imitators - with the exception of Cream's cover songs. Just my personal preference.