That 2010 class at FL turned out to be pure garbage. Those players undermined everything that had been built at FL (with Meyer's help). The other 4 classes are pretty close to a wash.
Well, I think most of the blame has to be laid at the feet of Muschamp. I think you can write that class off somewhat if you want, but you have to say ok Muschamp, you're recruiting these guys, you're coaching these guys, it's up to you to get results. He didn't, and somewhere in the chaos people seemed to forget just how much talent he had.
I also questioned how effective Muschamp would be at Auburn. It isn't that I think he's a bad defensive coordinator, but at Florida his results were not on par with his talent on defense. I wasn't getting how he was going to take worse talent at Auburn, and an offense that creates a disadvantage for the defense and somehow show much improvement. He hasn't, he's just not that good...
Now, a sudden turn around and it's just an amazing coach? No, it's a good, perhaps great coach who just used the abundant talent appropriately. You can't win with no talent in the SEC, it is not coincidence that the top 3 SEC teams right now also happen to have had the best recruiting classes over the past few years.