Yeah, there's a stupid statistic like he's never won a 5 set match or something but then again most of the time he either just rips that forehand so hard you can't reply or meets somebody that moves too quickly for him. Personally i could actually see him winning a Wimbledon in the future, his serve is fantastic, Nadal and Federer have recently struggled against him a bit and we saw at the likes of Indian Wells and the US Open 09 that when he turns it on players really have no answer. Unfortunately as Tophat says he needs more stamina and also he seems to have Murray's old mental issues.
Still at any rate he's almost certainly the world number 1 after Djokovic and Murray.