The Master Chief destroyed 80% of like 4-5 different alien races and he destroyed a zombie virus aka the flood. Sorry doomguy but master chef takes the cake.

80% of 4-5 different alien races? Destroyed the Flood? What drugs are you taking because that never happened. At all. The Covenant races are all still alive, and pretty much untouched in terms of population, aside maybe the Brutes, who if I remember right, were hunted down until all that was left were the ones on their homeworld*. The Flood isn't dead/destroyed/gone or whatever you think happened. That was merely one Gravemind and it's attached forces on the Ark in Halo 3. There are literally 4 other Halos, at least, with Flood spores on them. Not to mention any research stations that the Forerunners left behind... [i]Like the Arbiter's first mission in Halo 2.[/i] Seriously. There is tons of information/lore contradicting what you posted. [spoiler]* I have no idea about Halo Wars 2 or the Brutes and Covenant/Banished on the Ark, so they can be excluded or included at your leisure.[/spoiler]

Master chief destroyed millions of troops from an advanced alien army that destroys human worlds with minimal effort.

Invading Hell is more badass.

Imo defeating an armada of aliens is more badass. Don't get me wrong though, Doomguy is still a badass. And very much so.

Really? Shooting aliens is more impressive then invading Hell? Not to mention that he's practically immortal...