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Matt Schaub spent the first three years of his career with the Atlanta Falcons backing up superstar Michael Vick. Due to this, he spent very little time on the field and few people knew how good he would become.
In March 2007, the Houston Texans traded second round picks in 2007 and 2008 to the Falcons to acquire Schaub's services, fully intent on making him their starting quarterback after the failed experiment that was David Carr (due in large part to Houston having an exceptionally poor offensive line).
Since that trade, Schaub has gradually improved, culminating in throwing for nearly 5,000 yards in 2009 with 29 touchdowns and just 15 interceptions. In 2010, he threw for over 4,000 yards with 24 touchdowns and 12 interceptions. Houston has yet to make the playoffs with Schaub at the helm, (or anyone for that matter) but that is in large part due to a lack of a consistent pass defense.
For as good as Schaub has been, he gets very little recognition. His name rarely comes up when discussing the top QB's in the league, and the media rarely talks about him.
To top it off, Atlanta lost Michael Vick in April 2007 due to his involvement in a dog fighting ring. With no proven quarterback on the roster, they were forced to employ Joey Harrington as their starter.