Guy was good at La Tech and was pretty solid in his first go-around at MSU, but...yeah, you get the feeling they could've done better. Orgeron is the name that came to mind for me.
Oh, and this:
@BeastManSteve Manny Diaz stat: in 7 years as DC (2 MTSU, 1 MSU, 3 TX, 1 LaTech) he has had 1 top-30 scoring defense. '10 MSU (21st) w/9 future NFL players