I think that the current system has it's good and bad points:
1) It's too easy to get a weapon with the current system. Weapons in my opinion need to be overall more rare.
2) It's too difficult to get the weapon you want. Make the chest drop an item with a very low chance then go trade it in for a weapon.
3) The cooldown on the fight is too short. This helps with making the weapons more rare. A longer cooldown means not as much practice and in turn a longer delay before we see someone get the first kill.
Having all 7 weapons should be an achievement, not a sign of luck. The weapons aren't exclusive enough overall, in my opinion it's too easy to get them.
