I have to agree with aco, although my opinion is biased as zm is the best kind of map. Most of the ze maps that have been added are brutal, they require a level of teamwork that is now impossible on the server and several are just plain terrible. Too many of them get boring after only a couple rounds and empty the server when they are voted. I enjoy some of the ze maps, the classics and some of the truly original ones like paranoid, but as said most are just bad.
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