I wouldn't say he is that bad. Trestman definitely had a hand in the loss, but it is his first year so I expect some questionable decisions by him. On the 4th down call, he had one vs GB and got it, so for a coach, you are a genius when it works and a dumbass when it doesn't.
I agree, I would've rather seen McCown out there in the entire 2nd half, but Cutler is going to stay in until they carry him off on a stretcher.
I thought both 2 pt tries were odd, cutting the field in half on the 1st one and a run on the 2nd.