I disagree.
The idea of duel wielding IS to double your fire power and rate of fire. They should be designed to be weaker if you are only using 1. Why? Because a rifle is always better then a pistol. They have more fire power and much better accuracy. So why should anyone use a pistol over a rifle? They shouldn’t (even in halo 4 where the pistol is extremely high powered, a rifle is still stronger). Short range the rifle does more damage, long range the rifle is more accurate AND does more damage. The idea of duel wielding is to allow a player to gain a short range advantage. Long range a rifle is more accurate so it will win, but short range if you have two (pistols for example) you have more fire power so you can win. Dual wielding adds a great dynamic to the game. This doesn’t even take into account the possibilities you get when dual wielding different weapon types (human pistol + plasma pistol). Long story short - The idea of dual wielding weapons is to create many dynamic short range strategy combinations.
All this being said, I agree that it will be hard to balance. They need to have several different weapons designed specifically for dual wielding. Don’t just make it so you can dual wield the pistol (for example); instead keep the current high powered pistol with its zoom that you can only hold 1, and add another lower powered pistol without a zoom that you can hold 2. This should be done across the board. Don’t just make a weapon dual wieldable, create a new weapon that is designed to be used in pairs.
