I think that reaching 5 finals is a good thing in career who shouldn't be used to downgrade a career. For me you can say "X player didn't won Wimbledon which is a weakness in his career" but you can't say "x player reached five wimbledon finals, which is a weakness in his career!" I personally rank Rosewall in the top tier, along Laver, Federer and maybe Gonzales and Tilden (I have some work to do to be sure).
Flash, I agree. I just wondered about five W. finals as a PRO.