Common complaints amongst these letters fall into three categories:
1. "I was tricked into going to an expensive college"
2. "Other people screwed around but happened to network while I was busy studying all the time"
3. "I've been screwed over by the previous generation for reasons x, y, and z (usually debt, taxes, and the rich getting richer)"
All of these complaints are rather childish and point towards other people being the problem. Out of all of the letters, very few accept any blame and those that do are quick to deflect it with a "yes, but" type statement that leads into argument 1, 2, or 3.
You are not entitled to a job. A degree no longer sets you apart and the cost of college is the price of doing business in the world today in most large industries. You need to differentiate yourself in today's world and, more importantly, you need to be adaptable. Learning doesn't stop when you get your degree.