I'd give him a B/B+.
Tough conditions. He seemed to play smarter. He's learned to throw it at feet on a broken screen. Took some smart sacks, I suppose.. Didn't try to stiff arm any D lineman lol. He really needs to improve against the blitz. At least throw it in the dirt, toward the receiver, like Brady does. I think the Pats really understand how much sacks kill drives. Your odds of converting 2nd and 16 rather than 2nd and 10 are probably cut in half. That, I think would be the difference that would lift him from mid-level to high-level.
JA did make some nice throws today. I'm missing the deep ball more and more, though.