head to head
Call of Duty: Modern Warfare 2 asks more than DNF Duel, and the gap is variance.

Execution · Competitive PvP
Blockbuster 2009 sequel famous for killstreak chains and frantic multiplayer.

Execution · Competitive PvP
Arc System Works' Dungeon Fighter spinoff where an MP meter turns specials into a resource economy.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); DNF Duel leans Execution (Competitive PvP).
Call of Duty: Modern Warfare 2 leans a little harder on execution, though the gap is small.
Call of Duty: Modern Warfare 2
Fast time-to-kill rewards raw aim and reflex
DNF Duel
MP skill combos are lenient but conversions still need hands.
DNF Duel leans a little harder on reads, though the gap is small.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
DNF Duel
White-damage pressure and Awakening baits drive human yomi.
Call of Duty: Modern Warfare 2 leans clearly harder on variance.
Call of Duty: Modern Warfare 2
Spawn flips and killstreak randomness
DNF Duel
Deterministic systems throughout.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Modern Warfare 2
Killstreak economy, loadout and map knowledge
DNF Duel
MP economy management is the distinctive solvable layer.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.