Humans are flawed, and any system made by humans will be flawed. That's just reality. Whether the system is composed of human judges or human built mechanical judges, it will display the same biases of-, and will be vulnerable to the same manipulation by-, humans that exists today. People like cops and DA's will figure out, "Hey! Just feed it the right input, I'll get the output that I want!"

So if you want to switch to digital judges because you want to save some bucks by not having to pay the humans, well that works. But if you are expecting a better system at the aggregated mean, you're likely to be very disagreeably surprised.