Big caveat: I've never been.
Since MB opened with the HOB, reviews have always been mediocre. The reviews were typical for what you usually read about corporate concept themed restaurants (Hard Rock Cafe, Rainforest Cafe, Harley Davidson, etc). At first, food was considered limited and mediocre. They've probably worked on that over the years. Still, not a single person has reviewed it on the LVA website. That might say something.
If you go, it's a risky play. Might work out, but a gamble. There are better brunches in town. The only thing, they don't have the music piece. If that's what's really important. It may work for you.