Mexico are shit with or without "It" coaching. They have no real striker, no player that can attack through the middle and their midfield can't create anything. While watching their last qualifier (about 2 months ago) I realized they NEVER attack the middle of the field, everything is down the flanks with attempted crosses to the middle for a non-existent striker.
They are just atrocious in attack and on the offensive side of the ball. I originally thought Andres Guardado was a quality player, but even he isn't doing anything for them. If Vela and Dos Santos aren't the answers offensively they are in real trouble, though in no danger of failing to qualify. Having no one that can score, create or set up others is a bad recipe for success.