head to head
Call of Duty: Modern Warfare 2 asks more than King of the Monsters, and the gap is execution.

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

Execution · Competitive PvP
Arcade monster wrestling testing grapple timing and versus-mode throw mindgames.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); King of the Monsters leans Execution (Competitive PvP).
Call of Duty: Modern Warfare 2 leans clearly harder on execution.
Call of Duty: Modern Warfare 2
Fast time-to-kill rewards raw aim and reflex
King of the Monsters
Grapple timing and positioning decide monster bouts
Call of Duty: Modern Warfare 2 leans clearly harder on reads.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
King of the Monsters
Versus humans, throw-tech mindgames add real prediction
Call of Duty: Modern Warfare 2 leans a little harder on variance, though the gap is small.
Call of Duty: Modern Warfare 2
Spawn flips and killstreak randomness
King of the Monsters
Grapple outcomes carry arcade-era randomness
Call of Duty: Modern Warfare 2 leans clearly harder on optimization.
Call of Duty: Modern Warfare 2
Killstreak economy, loadout and map knowledge
King of the Monsters
Small movesets converge to known optimal loops fast
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.