High stress, high pressure and sometimes unachievable targets.
Shifts can include nights, weekends, will include holidays.
If you're in a managment position you will often find yourself working a lot of extra hours without compensation.
You often feel unheard by upper management.
Promotions within the company is difficult and often just into management positions.
Non-negotiable salaries no matter how long you've been in the company, no actual raises just the rearrangement of bonuses disguised as raise.