Shifts could be better scheduled. Currently, the only options are in the evening, starting at either 4 PM, or 9 PM. The 4 PM shift severely limits your options for second jobs, while the 9 PM shift will gradually eat away at your sleep time. A 6 PM shift, for instance, would make the position more viable for a lot of people with other obligations during the day.
There has been consistent communication failures with associates. Meeting dates are constantly in flux, for example.
Non-peak hours are inconsistent, which I can understand to an extent. However, the result is that a lot shifts will end early, leading to three hour days in a lot of cases. If you don't live close to the site, commuting costs will start to eat away at your real pay. It seems like far more associates are hired than necessary, meaning that most associates won't get more than 20 hours per week.
During peak, it can be very hard to fit in meal breaks. For double shifts, you typically only have thirty minutes to rest and eat within the 10-12 hour period you're scheduled to work. Double shifts are strictly voluntary, of course, but this lack of rest and nourishment really decreases productivity towards the end of the day.
Performance metrics don't really reward doing the job right. For example, all associates have to keep up a scanrate for sorting packages, but that scanrate doesn't take into account the size and weight of the packages they're sorting, which disincentivises employees from going after the bigger packages, even though management stresses that the big boxes are the priority when sorting. Generally, you have to sacrifice your own performance rating in order to make sure things are operating smoothly (though the coasters may rightfully point out that you're not paid enough to have to worry about this).
You have to be comfortable with slightly unsafe conditions. For example, the main job function is building pallets full of packages to be loaded into trucks, but since employees have no incentive to take the time to carefully place packages on the pallets, and so some pallets are liable to collapse at any moment.
