The US median cost of living is lower than in: Germany, France, UK, Australia, Sweden, Finland, Canada.
Healthcare is a very legitimate complaint. It's plainly outrageous. Even in the case where the bill is often mostly footed by an employer, that comes out of wages to one degree or another.
Housing is not a legitimate complaint (everyone doesn't live in NYC, LA, Seattle and SF). The median US costs on rent and housing are lower than any comparable disposable income nation, and you get far larger accomodations (space) in the US than the other nations.
Education is not a legitimate complaint. The US is overflowing with modestly priced, high quality in-state university choices, including quite affordable state schools. If you spend $160,000 on a shit paying degree from a tier two school for no good reason, that's on you. You don't get to bitch about doing something that dumb when you could have gotten the exact same degree for $40,000 and paid for half of it with a part-time job over four years.