Give Henne time and I think he will win everyone over. He has to get use to his receivers, the line has to get use to his cadence, and the game has to slow down for him. Henning needs to modify game plans for the long ball now, this will open up the field for our offense.
He will have growing pains. Both Manning brothers sucked it up at first. Rivers was just average at first. Sanchez is looking average - they're winning on defense. Flacco struggled last year. Matt Ryan did look good, but didn't force things and let the RB bear the weight. Terry Bradshaw was horrible his first few years, then look what he became.
Just a few examples of how you get your franchise QB.