Insatiable Expectations II - The B-School Perspective?

Most people from the top b-schools of India whom I have met over the years seem not much satisfied with their jobs.
"I'm doing nothing", "They are pestering me with too much of work", "I would have been better if I had just continued working instead of joining XYZ institute", "They don't know how to treat us", "This is the same thing that I used to do as a mere CA"
These are some of the reasons I have heard in the past few months, if not the past few years. These reasons are quite diverse and differ a lot from person to person. But what does not differ is the tendency to complain. But why are most people unhappy?
One reason I found out is that people have mammoth expectations. Once individuals enter a first tier b-school, they start believing that they will be leaders once they move out of their respective institutions. But the harsh reality is that, though b-schoolers get a head start in the corporate ladder, they still have to fight it out to reach the top. Education in a b-school is supposed to be an ammunition in the corporate jungle, and not a short-cut ticket to reach the other end of the maze.
All said, I wouldn't entirely put the blame on the b-schoolers. When you have 3 or 4 job offers in hand and choose one of them, you are destined to have high expectations in the option that you chose. There is also the fear that by working in the current environment one is narrowing down his/her exit options.
At the end of the day the question is still the same - "Are you happy with what you are doing?". Unfortunately, the answer too seems to remain the same