Immediate impact?

Rookie campaigns
Of the 78 QBs drafted in the first round from 1980 through 2011, 19 never saw action in their rookie seasons for their respective teams. Twenty-two started five games or fewer in their inaugural seasons, while another 22 logged as many as 10 starts.
Seven of the latter 22 started all 16 games for their teams. That list begins with Rick Mirer with the 1993 Seahawks and also includes Peyton Manning (’98 Colts), David Carr (’02 expansion Texans), Matt Ryan (’08 Falcons), Joe Flacco (’08 Ravens), Sam Bradford (’10 Rams) and Cam Newton (’11 Panthers). All aside from Mirer were first-overall selections.

Winning seasons
The list of first-round quarterbacks who guided their clubs to winning seasons while starting half or more of their respective team’s games during their rookie seasons is comprised of a select five: Marino (’83 Dolphins), Ben Roethlisberger (’04 Steelers), Ryan, Flacco and Mark Sanchez of the ’09 Jets.
Thirteen others accomplished the feat in their second seasons, 10 more followed suit in their third campaigns and 12 more took four or more seasons to quarterback their clubs above .500.
That, however, leaves 38 – or nearly half of the 78 QBs – who never have managed to produce even one winning campaign for the teams that drafted them. Moreover, 16 of those 38 were top-10 selections in drafts held prior to 2010 – a ignominious group that includes the likes of Art Schlicter (’82 Colts), David Klingler (’92 Bengals) and JaMarcus Russell (’07 Raiders).