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I'm not trying to be a dick here or say I'm better than you mate. Just curious about your statement of being bad but made Onyx.
Compare your clip vs mine - at the very start of yours check how quick the grenade comes out vs. mine last night in "regular quality MM" for me. There's a very detectable delay difference. Seeing that guy chasing while you're basically strafing says to me you're getting a far better response out of the server in all facets e.g. movement, grenade throws, damage feedback on enemies. I've run in a straight line next to other players and they're faster than I am getting across open spaces on say Darkstar. Might go part way to explaining your statement.
Of course the other team might have just sucked
http://xboxclips.com/Ozzy+Onya+A2Z/523dd755-64db-4255-8adb-2b33f940c457
(17 secs)
You can also see my grenade throwing origin is from the server side and in an older position than my current player position. My grenade comes out of my chest instead of my hand basically and is delayed way more than yours.