In reply to BnB and chris:
Re the depth issue- its hard to say. The domination of federer, nadal and djokovic (and murray) makes it hard to assess how good the rest are, and how good they are compared to previous years. Are they better than Borg, McEnroe, Lendl? Never mind Connors and laver?
What they do seem to be is consistent and with a longevity unlike anything seen before. And when you look at some of the players that used to get to the latter stages of slams in the past, I don't think they were as good as the 'second tier' of players now- and some of them were the 'top tier'...! (Step forward mr a roddick...)
So overall Murray is unfortunate I think; in another era, even relatively recently, I think he'd have won more slams. But there's always either federer or djokovic waiting there, its never cilic, or wawrinka, when he gets to the big game...