Frankly, JG is better than all of those except Junior / Senior Nathan Peterman (at Pitt). He's been bad lately, but his career stats are much better than Crompton, Worley, or Sims. Albeit, if he continues to play this poorly, Senior Worley might arguably be better.
I'd take Ainge or Bray over JG, though. I think Worley was also a better leader, but probably not as good of a QB.