>A PhD is stressful and takes 5-6 years, but it can be a great experience with the correct expectations and a solid plan. The main problem is that most PhD students don't seem to think about those things nearly enough and have unreasonable expectations.

Honestly, I think the main problem is mostly that PhD students are, on the one hand, full-grown adults supporting themselves, and yet are, on the other hand, paid McDonalds wages to do the most intensive intellectual work our society has for Goldman Sachs hours.