I think you throw Miami out of the college coaching equation....not an apple to apple comparison. He's not the only college coach not to excel at the level...Spurrier, Devine, Kush, Fairbanks all quickly come to mind. (Fairbanks did have a winning record during his NFL tenure) This is where Harbaugh does deserve a ton of credit...he's one of the few that has made the transition between pro and college and has excelled. Saban was only at Miami for 2 years, and didn't have much of a QB...an we all know that's essential at that level. I think it was him (could be wrong) that gave up on Drew Brees....and that was a huge mistake.
Saban inherited a MSU that was in bad shape in 1995. Had not had a winning season since 1990, and experienced NCAA recruiting sanctions from the previous coach. While not a juggernaut by any definition, he did get them into bowl games in 3 of his 5 seasons, knocked off #1 Ohio State in 1998, and took the Spartans to a 9-2 record in his final season. Obviously he made impressions, as LSU snatched him up and later won his first championship. I would consider his MSU experience a success as he had to rebuild a program that was down, and as we all know, the formula back then for rebuilds very different than today.