I like Master Chiefs dark green body suit and helmet.

Master Chief? Dual-wielding.
Woulda been cooler if he could dual wield some swords, get some Darth Maul action going.

his armor...... it makes the character.

I'd say I like that he's pretty much not a character at all, that's he's pretty bland looking and acting, and that I don't have the barrier of some crap character preventing me from immersion.

I like how badass he is and will just do whatever it takes to win the war.

I love that they have never shown his face. Please don't show his face in Halo 3.

He never has had a problem when reloading his guns. Not to mention, he reloads at the same exact speed every time... now that's just inhuman!

The cheesy acting.

The guy's been bioengineered and heavily trained by the military to such a degree, you can't even call him human. And that is why I like the Master Chief: he is a cyborg!

I like how serious he is as a character. When the aliens are running around screaming and acting all crazy Master Chief keeps his cool and just plows through enemy forces. Love it.