Everyone in my peer group at college has successful post-grad careers - it doesn't mean squat in terms of general happiness and life satisfaction, though. We're all making way more money than we need, but many are feeling rather empty otherwise.
Don't get me wrong, I enjoyed college, in so far as one enjoys a nearly-continuous 4-year stint of drunkenness spliced with pedal-to-metal studying.
But after we left, what did we do? Few of us had real hobbies - our time in college was either studying our asses off or doing keg stands to unwind, not exactly a lot of room for self-development or figuring out your passions. So we just kept doing it after graduation - hell, we were real ballas at the club now, not just broke-ass students!
The novelty of that didn't last very long. Some of us are still at it - but a lot of us are starting to wonder why we just spent all this time not having a life, studying our asses off, and now we're just a bunch of under-cultured, under-learned 20-somethings making too much money, with nothing more worthwhile in our lives than flashing money at chic high-end lounges and doing shots of expensive liquor.
Some people might look at this and think we have it great - and maybe you live this life also and think it's awesome. Personally - and for many of my peers - this is a nightmare. We lead an excessive, vapid existence despite having the resources to live fulfilling, rich lives... because we never bothered to slow down and learn how.