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.