While I won't agree that Rush ever jumped the shark before Vapor Trails, I will point out that if you look at their studio albums in sets of four, the first was always the weekest and the latter two almost always the strongest. In this sense it's almost as if they "jumped the shark" several times in order to re-invent themselves. Of course, as I said I like all of the "weak" albums; I just think they weren't as good as those that followed.