Tom Dienhart just posted his final unit rankings of every Big Ten unit in their respective football divisions. I summarize and give you my own comments based on his rankings. Now you can say that my conclusions aren't fair because I treat all units as equal and I don't consider coaching (#1 Jerry Kill!) or schedule. True, but it gave me the answer I wanted! You've been warned, so take it with quite a few grains of salt.
If you want to read Dienhart's articles directly, and I recommend that you do, here is a link to his last article which itself has links to all of the articles.