The best KIND of server I have gone to are fort wars servers.
Fortwars got really boring for me after I got really good with VCE. I now have a saved brick that once touched gives you super powers. It allows a number of chat commands that can cause you to jump super high, equip items, change size, heal yourself, rapid fire a number of projectiles, and teleport back to base.
With all that, who needs a base?