MM: So I fought 8 master robots that try to take over the world what about you guys? S: Ive killed space thugs and murders and giant beasts etc. MC: Ive killed armies of aliens that tried to kill humanity. MM: FFFFFFFFFFFUCK!
Flash Stopper, nuff said. Not saying that Master Chief and Samus don't dish out the pain, but I think Megaman's got enough upgrades, weapons, and allies to effectively kick their asses to Pluto and back as well.