I wouldn't call any of them good but I would call them mediocre. None of them are all that bad.
I don't know about bragging but having 80% of your teams in the top 40 is a thing. Like, the ACC has five teams that would finish last in the Big Ten and Big 12.
Meh, I already said if you only want to compare which conference has the best good teams while ignoring that bad teams then I agree the ACC wins.
Each conference is playing themselves. The only true way to know is how each conference fares in the tournament.
Watching BIG12 teams beat other BIG12 teams and SEC teams beat other SEC teams can only tell you so much.
If I was a fan of a BIG12 program, I would certainly brag on the conference, but it would bother me that nobody but KU can even come close to winning a title.
A title is the ultimate bragging right and the BIG12 (and BIG10) really lags there. I mean, KU has won it twice in 30 years and that's it. That's the sign of mediocrity.
The BIG East has been killing it and they're practically a mid major conference.
The ACC is the King in the titles race, but the SEC is right behind them.
I just think the NCAAT is where the rubber meets the road.