High prices, mediocre food, woefully understaffed, and messed up orders. Basically everything you don't want in a restaurant. My room rate came with $40 breakfast comp so there's that. I ate her twice during my stay at Vdara but would not have if not for the comp.
Unfortunately Market Cafe is a big drawback to staying at Vdara. It's really the only breakfast option (unless Starbucks counts). There are just way too many other options nearby to justify going back here.