He cant play defense. He gets torched by 2 Point Gaurds every time they play, Mike Bibby and Tony Parker. Which sucks for PHoenix because they'll be in the playoffs. Not to mention, Terry dropped a 40 oz. on Nash's head 2wice.
The only two negatives I can see in Steve Nash is that one, he is old. I know that is nothing he can correct or fix but it is one of his negatives. He won't be here long because of his age and he will probably be in the league for only 5 more years. I also think that he needs to work on his turnovers. He averages almost 3 turnovers per game and it would be nice to see decrease that to one or two per game. Other than that, he is a great point guard and he is playing great.
Nash is an older guy who can't play D, meaning strong offensive minded guards will have a field day on him. He plays the game at one speed, full throttle, so I have had strong fears of him being injured as he gets older.