Nate's positives are energy, hustle, microwave offense, and outside shooting. He's got the 3rd highest 3PT% on the team, behind Ray and Paul.
His negatives are that he shoots too much when he's cold, he's not a true point guard, and he's limited on offense.
It's going to be interesting to see what Doc does if / when Marquis, Wafer, Delonte and Nate are all healthy. At least one of those guys needs to be the odd man out. Especially if Wafer can get his outside shot going, I could be him supplanting Nate.