And thats where all logic of the discussion corrupts. The fact he said a realism-based arguement, and you post about which game is better.
That's the thing. They're two COMPLETELY different fictional characters, from two COMPLETELY different games, and there's hardly any way to compare the two.
Gordon Freeman's a rebellious, tyrant fighting scientist who fights based on what's in his environment.
Master Chief is a superhuman, combat trained, exo-suit and extra terrestrial weapon wielding space marine who goes around killing aliens.
It's as simple as that.