there's not much middle ground with RPs anymore, so i think the worst servers are the ones that are on different ends of the spectrum. i'll go into an RP server and see this huge open map with fantastic builds and all kinds of RP add-ons, and i'm like "oh stuff, this is gonna be great" and it turns out the server is a circlejerk for like 5 players that all know each other. then you just have a really open server where everyone can join and participate, but that usually leads into let's say "less than acceptable" administration that are unable to control 20 handicaps running around killing each other on terrible maps, and it's just a mess.
also military RPs cant be saved. ever.