Their opponent adjusted offensive ranking is 39th. For reference, AtM is 28, Louisville is 11, and GT is 38 (including the games where they were missing King). Maybe above average but they aren't great even adjusting for their relatively tough schedule.
They lost to LSU because Sellers played horrible, they were rushing for 6 yards per carry against a very soft rush defense. Their defense kept them in the game vs Bama. These three losses look great when you hear the names but each of those teams has 3+ losses this year.
Texas is way more complete than uSC, so is UGA. Tennessee shares their offensive struggles. AtM is probably more complete as well, though they may be worse at QB.