What makes a Darkrp server good

I agree with Daddy Longhouse with the non-mingy staff part. Make sure staff are at least 16 years or older. Also it helps when add-ons aren't just slapped on a DarkRP server and they actually work well together and don't lag the shit out of the server. Having a general idea of what you want to do with a DarkRP server helps, like general themes and like pixioso said, add-ons that are exclusive to your server that make players want to come back to your server in particular helps a lot.