Look at the top four teams in the SEC (Alabama, LSU, Florida and UGA). They're 4-1, 4-1, 12-1 and 9-6 against ACC, respectively. That's 29 of the 55 wins by those four teams.
Now, if we exclude Alabama, LSU and the UGA wins over GT (we just continue to crap the bed there), they've lost 17 wins and 3 losses off that record, putting the record at 37-38. I'd say that's pretty decent against "the dominant college football conference".
So, the SEC has two of the most dominant teams in college football in Alabama and LSU, who knew? Also, we haven't been able to {consistently} win against UGA, surprise!, surprise!, surprise!. I contend that Alabama and LSU would dominate most if not all conferences. Unfortunately, I think Florida and UGA would fair pretty well too. Other that that, they're an average conference. There are 2-3 teams doing the heavy lifting, and the rest tend to ride the coat tails.