Not really if you work as a contractor or freelancer. In those cases you have to shout to the world that you are world class developer. Recruiters or Managers love terms like world-class, ninja, rockstar etc. Its unfortunate state of our industry.

This is unfortunately true in life in general. Many people of decision making power are attracted to self promoters. So if you really want more opportunities and more upward growth, you'll get what you want faster by peacocking.

Any time I see ninja or jedi in a job ad I avoid it. Rockstar is borderline because Joel coined the term as far as I am aware and actually has some decent stuff to say about software.