Fun fact: 9/10 users with no linked gamertag are better than you at Halo. That doesn't necessarily mean that I am; but it does mean there's a pretty solid chance.
Anyone who claims rank is an indicator of skill is both a bad kid and a moron.
It's a linear EXP progression system. You play more, you get more credits, you level faster. Ability is completely irrelevant.
I really hope the -blam!-wits with the first few posts are trying to troll.