I just don't see what the hubub is about. I think he is as talented as anyone, but not more so. However his mental make up is questoinable. I count him among the top 5 or 6 newcomers. They are all equally talented, but I think he is the most frail both physically and mentally of them.
I'm guessing the '5 or 6' are Nadal, Djokovic, Murray, Gasquet, Berdych and Baghdatis (Monfils?)
Physically, although Nadal is superhuman, Djokovic has had injury problems, so have Berdych and Gasquet, Murray has had some problems but no worse than them.
Mentally, Baghdatis, Berdych and gasquet are all over the place. Murray might not be too good in his press-conferences, but on-court in the last year he's matured a lot and is very good in tight moments. I certainly wouldn't put him at the bottom of the pile mentally.