He was by NO means "bad."
The day might've gone to the defenses, but Tanner Mangum at least a force in the game.
Rosen simply wilted — & was saved by a special RB.
These are NOT the stats of a "bad" QB performance, win or lose, upper or lower classman:
http://www.espn.com/college-football/matchup?gameId=400757027
30-47 (244 - w a single late interception, which unfortunately ended the game)