McCarron... hmm. He reminds me a bit of Andy Dalton. But then again, Dalton (like Brees) seems to be getting stronger-armed each year. He was a bit noodly coming out. I honestly don't think either is an elite talent but those aren't falling off trees.
I think Bridgewater and Boyd are elite. Manziel is certainly fun as hell to watch. His punkdom doesn't seem to bother me much for some reason. I think Boyd has quite a bit more arm, certainly a quicker release, and better wheels.
Right now, today, I'd put the chances of the Browns drafting a QB in the top 10 at about 99.999875.