Overall, B-/C+. Like the team in general, he's inconsistent. He'll make a lot of great calls, and then he'll do something inexplicable...like the QB sneak vs. Wisconsin that, all by itself, cost Iowa the game...and the jet sweep to Fant, which resulted in a loss of both yards and Fant.
More misdirection in the running game, more throws down the field, more trick plays (flea-flicker, halfback pass, hook-and-lateral, jump pass from inside the five...). And I'd love to see the slant to Fant or Brandon Smith, especially in the red zone. Should be nearly impossible to stop.
He's on the right track. Now he needs to put his foot on the gas and be consistent. When that happens, look out. The Hawkeyes have the weapons, and I think BF is on the verge of figuring out how best to deploy them.