There are so many things to take in to account. Some of these QB have great numbers but cannot get it done when they need to.
I'm going to go with Cam Newton. He has talent but time after time enures the loss, plus his antics and attitude are questionable. I think it's everything besides the numbers that make him so bad. If Skelton was a true starter I would go with him. Romo is right up there but in the end he wins too much to say he's the worst.