The article is a little overgeneralized. The older Millennials were mostly Boomer kids and tend to be more bratty and entitled. I've noticed though the younger ones who are GenX raised are quite a bit more levelheaded.
GenX went thru this in the Bill Clinton era which tried to revive the hippy dippy flower child view of the world with the Slacker subculture. Then we grew up and got it together by the time his second term. I see Millennials doing the same thing as they get older, especially now that Obama is out of office.
The other thing is the rural interior ones tend to far less have those tendencies than their bi-coastal cousins.
I'm willing to give them a shot. I think in the end they might turn out pretty good. They seem to have a good knack of balancing being too tuned-in suburbanite drone yet not tuned-out commune dwellers. In other words, normal.