I think he is doing well. But he does need to show some improvement in a couple of areas.
First, he needs to develop an inside move. He gets into a bit of a rut constantly rushing outside and bull rushing. I have been impressed with his bull rushing. He did it several times against Jacksonville where he just got up underneath the tackle and drove him into Leftwich. Doesn't go down as a sack or a tip or anything measurable, but definitely affected the play.
Secondly, Mario needs to be more violent with his arms on both the pass rush and in the run game. He is engaged entirely too long with the tackle and just spends too much time "riding" the block instead of disengaging and getting to the quarterback. He needs to rip his inside arm up underneath the armpit of the tackle and lift him up and get by him. Haven't seen that as of yet.
I'd like to see the Texans employ more stunts with Mario as well. In the Jacksonville game, there were several occassions where he looped inside and was working on a center or a guard and they had a lot of trouble handling him. This is the only time I saw them run that stunt.
I'd also like to see the Texans get out of this dropping Mario into "coverage" garbage. He is not a cover guy and our defense has enough trouble conventionally. Zone blitzing is not the winning edge. The TD to Vince Young on Sunday was a blown blitz package. We brought pressure with two linebackers coming to the left side of the offense. Mario dropped into coverage to the side they blitzed to. However, the one linebacker came from the right side of the defense, thus vacating the zone. The defensive end to that side needed to drop, or better yet, Mario needed to be on that side mirroring the QB. Either way, it was a silly blitz that was totally uncalled for. Send Mario and let him get to the QB. Drop someone else!
I think he totally shut down the Jags' run game to his side when he was in. Not really mentioned much, but they ran for about seven yards going to Mario's side that day.
Overall, I would give Mario a B-/C grade with the potential to definitely be an A. I think he is going to be a premier DE in this league and will be a staple of our defense for many years to come.