In Rex 2.0's defense, he did have to deal with a crap ton of injuries. Jay Ratliff being chief among them.
That being said, we don't have a DeMarcus Ware, Anthony Spencer, or a Ratliff on this roster to make that 3-4 sparkle, and I don't particularly like the family the guy comes from. They are loud mouths.
I think he's one of those coaches who looks good with talent to lead, but can't coach up 2nd tier guys like we have.