A conference can SEEM weak if the traditional good teams are down, even if traditionally mediocre teams are up with the same exact records.
Helmetitis.
Imagine in some year, the SEC "powers" are all 7-5ish, and UK and MSU and Arky are vying at the top 11-1, Vandy is 8-4, and South Carolina is 9-3.
Or, we see Bama and UGA and LSU 11-1 (I wish), UF 9-3, Auburn is 8-4 and A&M is 9-3. It LOOKS different.