The SEC East was pretty weak when Franklin was at Vandy and the cross overs were pretty lucky. Power 5 wins while he was there:
2011
Ole Miss 2-10
Kentucky 5-7
Wake Forest 6-7
Uconn 5-7
2012
Missouri 5-7
Auburn 3-9
Kentucky 2-10
Ole Miss 7-6 (3-5 in conference)
Tennessee 5-7 (1-7 in SEC assuming easy non-con)
Wake Forest 5-7
NC State 7-6
2013
Georgia 8-5
Florida 4-8
Kentucky 2-10
Tennessee 5-7
Wake Forest 4-8
Georgia was the one team he beat that was over .500 in the a Power 5 conference. He wasn't beating Alabama or LSU. He missed them. He played Auburn without Malzahn the year Chizik got fired. His only win over Florida occurred 2 weeks before they would drop to the mighty Georgia Southern.
Franklin should get credit for bringing Vanderbilt to mediocrity. That's not an easy thing to do, but he didn't exactly leave a great foundation. Plus, Mason appears to be in over his head.