Well another thought is to have counters to the different types of weapons vs armor. Example - bullets with armor piercing is effective against kelvar armor. Hollow point bullets is effective against light armor, eg. leather armor. Than u also have armor that is good against plasma, laser weapons but bad against bullets. In other words, making more differentiating difference between the different types of guns/beam wpns and armor will make it more difficult to have the ultimate build. Than u have the regular armor that is decent against both type of weapons. In this way, there is no ultimate critical build or big gun build than can dominate all cuz the armor will be the limiting factor here, and u give everyone a fighting chance with the right protection.