As wbbnm said, the original TN route starting in Jellico seemed to spend a lot time in the middle of the state not making much forward progress just trying to include short sections of dirt roads. There were definitely places I could have skipped there.
However, The re-mapped TN section from 2012 that starts in Tellico makes much better progress across TN and was much more enjoyable. I didn't really run into anything that we wished we had skipped. Even the paved roads on the new TN section were much more enjoyable and scenic and fun to ride. The new MS section is also much better overall I've only been as far as the AR/OK border and only did AR in 2009, but I found AR a lot of fun.