There is a time and place for everything: Rush rightly criticized Bush roundly on many occasions, but to "pile on" with the Left---especially when the criticisms were 180 degrees opposite, well, that's something only an elite member of the media does, even a conservative elite member of the media.
Buckley, OTOH, just lacks vision, even in his brilliance, and that's where his critique comes from.
But great men of vision......both Reagan and Bush 43......are unaffected by the criticism of those who can't see what they see.