I don't think he was specifically aiming for the knee, but the kick sure as hell was intentional.  I thought the same thing about Suh.  At the speed the game is moving (ok, everyone else but Brady), they're not going to be able to accurately aim a kick.  Suh was just trying to kick Schaub and happened to catch him in the worst spot.  Brady was going with a pathetic attempt to protect himself.  If anything, I bet he thought he'd catch Reed in the stomach area. 
  
But yeah, blatantly illegal.