Here's how I see it, it takes "different" skill but not more. Those who say it does should do some gameplay and actually research it. Halo 3 I think it's 30-40% skill and the rest PURE luck with spawning and timing. Also your weapon over theirs.
COD I think is just camping and one shotting. COD is not really skill, but advantage. A 5 star general has way more perks than a recruit or a colonel so if it came down to it a general" with more exp" would easily win just from a couple little perks, not really skill.
However if a recruit did beat a general then I would put that into the skill category of COD.
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LOL. I have played 3 games of social in about 4 months and I bet that if I got 3 people off my list who hardly play halo any more and you got 3 colonel buddies who still play daily, you'd get destroyed. 70% luck because of spawns?? If my team stayed on our side of the map the whole game you'd still lose. Lol. People who get a legit 50 are 50s for a reason, they're better than 99% of the ranks below them. Ive only ever run into a small % of players who were legitimately ranked lower than me and they were better. I found them in MLG.