Sure, other players may have had better games in the Texans' losing effort against the Raiders (Brian Cushing, DeMeco Ryans, and Johnathan Joseph spring immediately to mind). But this is the last time Super Mario will be eligible for this award during the 2011 season, so he wins.
If you have a problem with me bestowing this make-believe award on the player whose five (5) sacks in less than five full games paced the team, please speak up in the Comments. I would ask, however, that you bear with me, as all this weeping tends to delay response time.
Here's hoping Brooks Reed is a quick study.
Raiders vs Texans coverage