Starting to look like the ever going debate about the functional/inventive drummer and the drummer's drummer.
Technically Ringo (for example) is a midget compared to Peart, but somehow musically they have the same function, they created drumparts that are an integral part of a song. Personally I just can't listen to Rush, it makes me tired and nervous. I don't like the Beatles either, the're way to sweet for me. But that's beside the point, that's just taste.
I have the uttermost respect for any drummer getting a song really going, moving people by it, making a living out of it, selling records, etc. None of the drummers mentioned in this thread are overrated in my point of view.
What I find strange is: Why would Peart retire at all? Ok, because of age he can't do what he used to do, but why not do something else?
I saw youtube clips of Steve Jordan laying down a hell off a groove with the verbs, with only one or two simple fills somewhere. It had a damm good feel and he didn't look bored at all playing it. Looked like he was completely present in what he was doing. There's more to music than complexity. There might be a new musical and spiritual journey for Peart to make.