If I have one piece of advice for people applying to grad school, beginning grad school, or in grad school, it’s this:
Don’t be this guy.
Jerry, via Rate Your Students, is bitter and unhappy because he feels cheated, he did everything right and only now figured out there are no jobs.
You HAVE to get the PhD for yourself, not for the job.* When it stops being for you, it’s time to choose a new path, even if that means walking away in the middle.
*It follows from this that accumulating debt for the PhD is a bad idea.