College. The learning is fine, the cost is freaking out of hand. I never went and have no regrets. My daughter is going now and I feel like I'm supporting a scam.
Anything you take out loans for is a scam. I doubt the cost of houses or college would be anything like it is today if people weren't enabled to pay it by banks.
In Australia you get a loan for university, but the loan is an interest-free loan with the government (it's just indexed for inflation once per year), you don't have to pay it off until you're earning over around AU$55k/year, and the government heavily subsidises the cost for citizens and permanent residents.
Definitely not true in all of Europe. We pay in the Netherlands. In fact, I decided to go to school here since I never got to in the US, and found out I can't even take out a student loan because I'm over 35.
Depends on the degree. Internet made colleges much more obsolete than what society care to admit. This is an oversimplification of course. Education is a complex subject.