I think the worst work culture you can experience is nepotism and corruption in hierarchy. What do I mean? Well, this happened (and I think is still happening) in my last job. It was a huge logistic/delivery company. I was an intern, working as assistant developer of the only developer of the site. There was also a guy that was the technician, his assistant, a DBA and that's it.

Well, my partner and I were working on a system that managed almost all the operations of the company in this city.

Well, I supplied the dev two weeks when he was on vacation. I knew almost all the system. what happened? the manager from other city came with another Dev, and I'm not saying that I was an expert or something like that, but that dev from the other city was an incompetent. He couldn't even make a small GUI change without messing it all...

Guess what? The company paid him weekly round tickets to come and go from his city to ours (two hours of flight).

I was too disappointed I started searching another job. A week after getting my degree, I left my job and started in the one I am now. Before leaving, I asked my boss if there was a realistic chance to grow up. He answered no. To be honest, that didn't surprised me :/

The thing that makes me angry about this is that a lot of companies give chances to people that come from other cities, even if they don't know anything >:v

Oh, I almost forgot it: The last five months I was working there, they quit our office and send us to trailer-offices :/