I don't think you can generalize any group; but I do notice a number of things with millennial's.
-They seem to be rude or just not have manners; often thinking they can say or do what they want with no consequences. I think some of this comes from having so much interaction on facebook, twitter, etc. where they can spout off heartless rude things and no one punches them in the face. I also think that part of this comes from the zero tolerance rules about fighting in school. I am 50 and if at 25 or in HS I spouted off or acted like a punk someone would have said something or worse.
-Many seem entitled, take college tuition for example so many of them are in debt up the zing zang and expect someone to pay it off or for the debt to go away. Never mind that they decided to take the money and in many cases get a degree that is completely useless in society.
-They seem ill informed or lack the desire to actually look at the reality of things. Several here have mentioned how they are screwed with the debt previous generations are leaving them. However who have millennials voted for? Generally it is people who promise all kinds of free stuff and they fail to look at that and say well who will pay for that.
There are lots of other things I see in this group and even those younger than them. Overall I think the majority of these generations are just soft. This statistic should be eye opening; but less than 20% of military age eligible people in this country are capable of actually serving. Issues range from fitness, health, debt, criminal record, having to many kids at a young age etc.
-On the flip side I do see a number of millennials that are willing to step out of the box and take chances previous generations never would have. Starting a business based on something they really like, willingness to forgo the so called "American Dream" and do things like travel.
-Many do seem to be more cause oriented, although I often think they don't have the full breadth of the situation understood when they get involved in certain causes.
- Another thing I have to admire is how so many volunteered for military service in the height of a war; fully knowing that combat was likely in their future. Many have also started small veteran help groups all just to assist with issues their generation are having.