14 of the 16 teams left are from the Power 5 and 1 of the non P5 teams is Gonzaga so basically15 of 16 from major conferences or traditional powers. 5 ACC, 4 SEC 3 B10, 1 B12, 1 P12, 1 AAC, and 1 WCC.
Also amazing is that Oregon is the only team in the Sweet 16 that could be considered a surprise team. All 12 top 3 seeds made and 2 of the 4 seeds made it. The 5 seed that made it was favored in its game against the 4 so not even an upset. The 12 seed is the only real surprise and that 12 seed was in the Final Four 2 years ago.
I know people love a good Cinderella story like Loyola Chicago last year, but this is how you see the highest quality basketball. Whoever wins this tournament will have earned it this year going through the best teams throughout the season to do so.