The good thing about A.Murray though, is that the does work hard on his game. He isnt like some English sportsmen who get photographed by paparazzi coming out of night clubs, get drunk, shag ***** and rely on sponsorship deals to finance the lifestyle.
The problem is that he comes over as a spoilt bratt, especially on court. And the faces he makes look nasty. Maybe in time he will mellow and improve. As long as he doesnt get into bad habits, he can improve.
The problem is that he will need to improve to the level of Federer and Nadal, in order to win the top tournaments/slams, regularly. And as has been mentioned in this thread, these players are probably the best ever. Hence, to win, he will need to be one of the best players ever and probably THE best British player ever. I'm not sure if he will be able to pull this off.