Depending on how the system works , and in the hands of the right player 20 percent could be substantial, but also quoted from the devs, skill is the primary factor in this game, and it will be in all aspects of it of course. So obviously the higher ranked player will be at an advantage, it is present in every game, but the lowbie still has a chance
Should be interesting in the upcoming months to see how the weapon mods will play out, and I wonder in game if there will be any cookie cutter builds for assault class for ex...hmm..