Meh, personalities are hard to measure without knowing someone; likewise, a 'competitive' or 'intense' person is hard to measure until you've gone toe-to-toe with someone. I agree he seems to lose focus at times and needs to take better care of the ball, but that could be just age and time in the game. If I remember correctly, he has only been playing organized basketball for a handful of years and of course missed all of last year. I am excited for his potential and really glad that he's stepped into major role after Stokes went down.
Consider some of these freshman stats:
Cartier Diarra: 71 assists and 68 turnovers
Kam Stokes: 57 assists and 44 turnovers
The Flush: 50 assists and 50 turnovers
Wes Westicles: 61 assists and 42 turnovers
Mart Irving: 24 assists and 15 turnovers
Will Spradling: 63 assists and 40 turnovers
Angel Rodriguez: 101 assists and 85 turnovers
Clearly Diarra needs to improve his decision making, but its not like he is massively behind some of our previous ball handlers.