Finally, someone taking a shot at that misconception. Just because some people advance their career and improve their conditions by changing employers doesn't mean they're unreliable or incompetent.
Quite often it's the competent people who get sick and tired of a crappy job, widespread incompetence, excessive office politics and stuff like that and they decide to move on. They tie the loose ends, dot the i's, cross the t's and start looking for a better opportunity.
It's not just the startups that mislead people, either. It's just that a big company will lie to you about other kinds of stuff.