Being on call for most of your days off and expecting to get called in for most of them. Constant turnover means you're always going to be filling in, and there's little incentive or initiative for anyone to get creative in regards to working around it. In addition, there's a lot of extra time you're expected to commit to the job outside of work, creating a negative work/life balance. Pay is okay but not special. 12 hour days are difficult. No shift differential for working overnights.