My opinion, this could be a good hire.
Overall 1000 ft view: It seems clear that Mac is intent on cleaning house and ensuring that his team is HIS team, doesnt want any lingering staffers adding friction and any players looking to those individuals for a life-line when the way something has always been done is now different. I think thats probably a good strategy. Clean house, fresh slate, new blood, no playing mom against dad and vice versa.
50 ft view: First, the big plays that Ms St. D gave up this year were far beyond acceptable. They had a great red zone D but between the 20's it was pretty bad. Against bad to above avg teams you can probably get by with that if your offense is good but the top teams find ways to get 6 if they get a 1st down at your 20 yd line. This could be an abberation and I hope it is but if this becomes a trend for his defense, we are not going to be pleased. Secondary was mostly to blame; front 4 and front 7 played quite well and considering our talent in the secondary I'm fairly optimistic about this point. Second, I am a little dissapointed we are moving away from the 3-4 style considering all the spread teams that are popping up within the conference. I think its easier to cover sideline-to-sideline using 4 LBs who are faster and more mobile than it is using 4 DTs and theres less of a chance of play-faking to open up running lanes around the edges when you have an extra LB for spacing. I also think we have a lot more quality LB depth in state than we do DT depth so 3-4 may lend its self better to local recruiting.
But what do I know, I'm just a GCMB poster with a chefs hat and a wooden spoon.