Fields does a lot of good things. The one thing he doesn't do well at all - and this is an understatement - is shoot the ball. That includes his absolutely horrific free throw shooting, and you have to wonder if the guy needs a complete overhaul of his technique. His handle is sub par for a 2 guard, and though he manages to cloak it reasonably well, he is only really capable of being a threat with the ball in his hands (excluding, of course, as a passer) when attacking the rim directly.
On the plus side, he's become a dependable and versatile P&R passer, and he has always been adept at moving off the ball. He has his traits and plays them well, but until he can shoot with a shred of consistency, he deserves his detractors.
Defensively, he's apt. He has a tendency to lose concentration however, and a mistake on his behalf is usually a complete blunder, and we've all seen how Woodson reacts to that: fittingly.
Very interested to see how effective he'll be with Lin back - those 2 play extremely well together.
All in all, as big a fan as I am, Shump should be starting once STAT gets back, IMO. His shot and defense are better, and the offense will run sweeter for a rejuvenated Melo if we can space offensively, and let our defense setup a transition game.
For his salary, Fields is a big plus for this team. Until he finds that shot, however, I understand the frustration and negativity that gets thrown at him. It really is that bad.