how does halo 3 skill sysytem work?

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On ranked matches, for example somtimes i see players who have 0 exp in a playlist and are already ranked high. How does this work? Also i dont understand why i only rank up little or nothing in playlists like team slayer and lone wolves and i always win and im the mvp.I win like 15 games straight rank up 1 or 3 ranks.But then i lose a couple of games in a row because of bad teammates and get ranked down 2-5 ranks instantly.Then i start winning again and it takes forever to get back to how i was.Can someone explain this.

 

[Ian]

The playlist-exclusive experience points and the white experience-based rank symbols weren't introduced until a year after Halo 3 came out. The people you're talking about earned their playlist ranks before then, which explains why they have low experience.

I'm not really sure how the ranking system works, but if you want to get your highest rank up, play Lone Wolves. You rank up faster if you score higher. It rewards skill more than Team Slayer and it's not as punishing.