Auburn's offense is horrific most of the time with flashes of being able to move the ball. The only threat I see that they have that will be useful against Alabama is a running QB.
Auburn's defense, particularly their linemen, are excellent and will make things tough for Alabama running and passing. I do think Alabama may have some success running around Auburn though.. (i'm including the screen game).
Mac is very quick and accurate on his screens giving his receivers and backs a lot of time before contact. They will need that on saturday.