One could of course weight different achievements in such a ranking, NC counts for X, playoff appearance counts for Y, NY6 bowl game counts Z ...
I think a decent ranking is just taking AP final poll positions and giving points 25-1 for finishing 1-25. You might add points for top 5, top 10, etc. Maybe.
But really it's not worth the effort in my view. I had forgotten FSU had some good years early in this decade, that is how fast they have fallen.