The pros:
He has a very high floor, and can build a program and get it to regular top 10 contention.
He is one of the best out there at finding underrated players, and turning them into very fine collegiate performers, and yes, even into NFL players.
The cons:
His ceiling doesn't extend much further than his floor. Beating the best of the best only happens once in a blue moon, at best, and only when circumstances are in his favor (Clemson 2020, during the regular season).
He has a very difficult time developing highly rated prospects.
He throws people under the bus, instead of taking responsibility.
He plays his favorites all too often, choosing to stick with the low ceiling safe choice. He won't hesitate to yank someone in favor of his RKG instead of giving that guy a second chance.
I'm not even including his temper, along with letting some of the better players rot on the bench, or how his loyalty to his cronies would keep terrible assistants on his staff (Longo, Van Gorder, etc).