Been mentioned many times, but apparantly it's blizzards fault everything isn't turned on by default when you lower the settings so low. There is no issue here, you just turn it on.
Fact is, these pcs do not meet blizzards recommended settings and that is the key issue here. This isn't new, it's been around since the dawn of pc gaming - if you drop the settings to low, you will be getting sniped by snipers you can't see, passed by a car that never even appeared in your rearview mirror, and generally speaking, you will have a bad time.