Orton was the best for sure. It's strange how eager the fans were to run him out. He averaged 250 yards per game and had a 65% completion rate.
And his WRs were the rookie Watkins and a bunch of has-beens.
Flutie was fun to watch but he was an ineffective QB. Bledsoe was a solid QB once upon a time, but when he arrived in Buffalo, that time had passed. Fitz was a good leader, not the best decision-maker, and didn't have a lot of weapons to throw to. Tyrod is pretty darn good compared to the guys on this list. He's got no one to throw to, so there's that.
Orton
Tyrod
Fitz
Bledsoe-Flutie