Benefits package is the worst I've seen (would cost me about 1/3 of my take-home pay to cover myself and my medical needs).
You are basically paying out of pocket for everything so unless you are perfectly healthy, you are immediately thrown back under poverty line.
Christmas... not paid, Thanksgiving... not paid, New Years... not paid
You are forced to be out of work and not get paid.
401k, no matching
No Vacation
No sick time (unless you're located in a state that mandates it).
You hear all about how well the company is doing and how they are expanding thanks to the money they make off of you.
You are just a pawn to earn them money but don't expect the company to care about you.
They get paid for every hour you work hard and offer absolutely nothing in return.