In my short time (less than 6 months) at Mark's, I met some decent co-workers and some not-so-great managers.
While I'd just worked at one location, that can be left up to the imagination which, I can safely say it is not a pleasant place to work. No positive anything; attitude, reinforcement, environment what so ever. Forget about training, and I'm not talking about a day on a computer watching videos. I'm talking about real human interaction and direction. You're expected to do everything, and just know how.
Most of all it starts at the top - management. There was no "managing" being done. Instead there was disrespect towards all employees, a sense of importance that could never be trumped, poor attitude and overall childish behavior. All of which I think are inappropriate for a manager to portray, and impossible for employees to respect.
In the end I know for a fact talking to co-workers that I was not the only one aware of these issues. I was just one of the few that was not willing to put up with it.