Can be annoying just in general.
Half the time you don't get trained very long. They just let you go and see if you got it.
Hard to get hired in. Have to be buddy buddy with the right people. Took me 15 months
Not a lot of room for advancement.
Work most major holidays. The only one you really don't work is thanksgiving. They try to make up for it when you're hired on by giving employees EXTRA PTO time (floating holidays)