What is the point mentioning last year? Schaub had Houston at 7-3 last year before he got injured. That was the first year he didn't have a terrible defense. In 2010 Houston had a historically bad defense. There was a period that year where the defense gave up over thirty points every game (7 games straight).
If you're just talking about the last two years then how can you say Flacco just wins over Schaub? Flacco got the Ravens one game further than Houston last year (despite playing a non-Schaub Texans), and didn't Houston have more wins than Baltimore this year? This argument seems inconsistent to me...
Bottom line, this is the first time Schaub has experienced the playoffs. Last year he got injured and previous years the defense didn't do it's job. Does Schaub have what it takes in the playoffs? I honestly don't know, but this week against the Patriots will be his first real challenge in the playoffs.