Poor quality video on POE security cameras

I have 4 POE cameras on my house with 50Mbps symmetrical fiber service. I am unable to read a license plate at 15 feet, I have trouble determining if I am looking at a racoon, opossum, or woodchuck. I have watched a fox cross behind the house well with the alert zone and received no alert nor video recording. These are not the expected results based on the advertising done by the vendor that convinced me to purchase these cameras. What gives?