The ACC’s reputation wasn’t built in a year, five years or even a decade. The ACC has been the most dominant conference by far over a long period of time. One bad year (and this hasn’t been that bad yet) doesn’t change that.
So, I give you David Glenn’s piece from last week detailing just how dominant the ACC has been in the NCAA Tournament.
My favorite paragraph:

Since the field expanded to 64 teams in 1985, the ACC has had 111 teams in the NCAA Tournament, about the same as the Big East (116). Yet the ACC has 221 wins in that span — 35 more than the Big East. The Big Ten has had 124 participants since 1985 yet has 42 fewer wins. The SEC, with 110 participants, has 61 fewer wins. The Pac-10 has less than half as many NCAA wins as the ACC in the modern era. Since the Big 12 formed in 1996, it trails the ACC 96-72.