Just a little sidenote about the rage-quits. I think that NS2 should block the Esc-menu for a couple of seconds after you die. Battlefield 3 do this. It reduced the rage-quits with up to 30% according to a friend of mine who work for DICE i Stockhol…
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Just a simple K/D ratio system won't solve the the balance problem. You will need something more advanced than that.
Like the ELO -rating system which is beeing used in a lot a games (ex: LoL, Quake Live)