pay structure is not good, they call it "hourly" and you will have to document every 6 minutes of your day in order to get paid.
your success is driven by the team you get placed on. if you have a slack team, or you dont mesh well with someone - it will impact you more than it should.
management is all about "the numbers", they'll tell you "not to worry about the numbers" until its review time, then you find out you really should have been worrying about "the numbers" because your judged heavily by, and ability to make more money relies on it... not such a problem if you weren't being told one thing then another.
very hard to have work life balance. you're expected to be at work 10 hours a day mon-fri. if you have a .5-1hr of commute, you're out 12hrs of your day, humans should sleep aprox 8hrs, you dont need me to do the math, but that is 4hrs of personal time per day. Great if your wife and kids already hate you, as well a great way to get your wife and kids to hate you.
they put you in "on-call" status multiple times a year, and the expectation for it is absolutely ridiculous. meaning you still work your normally scheduled +10hr shift. you go home, you must keep your phone on you and take the call if it comes in. doesn't matter if it's 6pm, or 2 am and you're sleeping, if you don't answer, you will get fired for it. totally unfair, especially if you're the unfortunate soul on a team on call for amazon. you will get the call, and you will be completely exhausted afterwards.