So what if the ETQW rewards system would work the other way around? You start with max. upgrades like sprint, silenced akimbo pistol, full health revive, self arming mines, etc, etc. And you will loose them during the campaign because you are so experienced and such a great shooter :). Why working for upgrades anyway? I am sure that starting with all upgrades on max will change the game. Feel free to drop some scenarios why it would be fun or terribly bad.
If you would ask me personally, I think the XP rewarding system is too high for 3 maps only. Mostly its very rare that you suddenly have Charged Blaster or the Akimbo pistols. So again, my question: What if the ETQW rewards system would work the other way around? (tech question: Too much data?)