The Sam Bradford at 15 is IMO destroying any credibility this list may have. 7 years, never made the playoffs, and he's ahead of guys who've gotten there consistently like Dalton (granted, he's had AJ Green to throw to), Flacco who has won a Superbowl, and Eli who has won 2 Superbowls.
Also think Stafford is too high and it's too soon to put WInston, Mariota, and Wentz as high as they are.