IndeedIt's hard not to feel at least a little bad for them when you read threads like this where people will put Andre ahead of Mac on the basis of having 1 more slam. I've heard players like him not necessarily regret their decisions, but definitely bemoan the fact that years later their entire careers got boiled down to a single number with no other context.
Big Mac was the man for a couple of years (not to mention the guy that sent Borg into retirement).
Agassi beside that 1999 run was always that other guy after Sampras.
McEnroe also won a bunch of slams in doubles. Something the likes of Lendl, Agassi never got close to.