I don't get the "if you can't do better, don't criticize" line of thought. There's no logic to it. If that's the case then noone here should say anything about singers unless they can sing, and we guitarists cannot comment on [gooey brown stuff], out of place, drum solos. I don't need any credentials to say that Jimmy Page's playing is sloppy. I just need my EARS and PERSONAL TASTE.