I don't they're overrated by those who really can evaluate teams in the Big 12.
Oklahoma and Texas are legit, but the rest are teams built around throwing the ball around against a lot of teams that can't play defense in the conference. Oklahoma and Texas are the only two teams in that league that would be top 5 in the SEC.
Yes Tech lost, but let's look at the defensive stats:
Tech vs Ole Miss (Tough SEC defense):
24 First Downs
469 Yards of Offense
24 Points
Tech vs OU (Weak Big XII defense):
20 First Downs
406 Yards of Offense
20 Points
Tech also had 3 defensive starters out of that game.......so go figure.