Erm, I hate to tell you this pheonix but a few bullets can deplete the Masters shield. It was part of the fun knowing that you could be killed by pretty much any enemy quickly if you didn't keep your wits about you. Sorry but Samus' arm cannon will break the shield rather easily. And a magnum bullet won't do much to Samus' armour except scratch the paint. A rocket...yes, sustained rifle fire...yes, couple of shotgun blasts to the face...definitly but magnum fire...no. Samus has the advantage in armaments (MC can only carry two guns and some grenades,) movment (dash attack for speed and the ball to move through areas MC can't reach,) jumping (4 metres with the screw attack to turn it into a weapon) and enviroment (Gravity Suit renders her immune to lava and acid and allows her to operate submerged as she would on land). I'm not saying that MC can't win just that the evidence points to Samus.