Unfortunately my time zone and working schedule doesn't allow me to play too much on the servers exept on the coop one but i'll give my opinion on this.
What had been said about the PvP server is true it should be kept as "genuine" as possible,the tactical realism of this game is awesome and whe should keep it like it is .
Now speaking about the custom server this is a complete different story in my opinion.What brought me here about 7 years ago was the cod4 Ace mod server and what kept me here was the cod5 customs maps server both totaly unrealistic and far from what the game makers intended to do but super fun to play.Not to mention the cod4 freeze tag servers,i personaly don't like this mod but we must admit this is a big succes ...
So please don't forget that customizing servers is our dna here at XI . Speaking about the custom server i could run around the maps wearing a daffy duck suit and handling a laser sword as long at is fun to play,fun is realy the key word on this type of servers .