servers without admins, and players that impersonate others players.

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there are different opinions on what a good admin is. some dont even believe in admins ruling over other players. its not for you to decide what the rules for all admins on all servers should be.

hmmm yes, there is a list of rules of what a good admin should do and should not do: http://wiki.cubers.net/action/view/Serve...nistration

your problem only affects you personally. you being impersonated doesnt affect the health of the game

Yes, it affect to the playing experience of people that are beeing insulted or teamkilled and that guy is under quico's nickname so people who meet him would doubt if ban him or not because they dont know if he is fake or not. They win time and credibility under a known player nickname except if we blacklist that type of people or having admins that could be alert for them (not possible in non administrated servers, because some people vote what they want (f1 or f2) and dont know what is going on).

banning lots of popular servers will kill the game

I dont think so, because people dont play AssaultCube to go to the same servers over and over. People, specially new people go to a server with maps who likes and they do not care of which server is. And most of famous servers have information to contact them and they are well hosted, he means that servers without any admin never shown or a person who takes control of bad behaviors , should be banned and in my opinion, a rule to launch a server should be put in additional server info. who host and admin it and where to contact them, this form we evade most problems of admin abuse in home servers or no-admin in server which people take advantage of to trolling or behave bad.