head to head
Call of Duty: Modern Warfare 2 asks more than WWE SmackDown! Shut Your Mouth, and the gap is execution.

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

Execution · Competitive PvP
Reversal-timing wrestling that becomes a prediction game against humans.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); WWE SmackDown! Shut Your Mouth 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
WWE SmackDown! Shut Your Mouth
Grapple timing and reversals reward quick hands
Call of Duty: Modern Warfare 2 leans clearly harder on reads.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
WWE SmackDown! Shut Your Mouth
Versus friends, reversal baiting becomes a prediction game
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
WWE SmackDown! Shut Your Mouth
Mild AI and momentum randomness
Call of Duty: Modern Warfare 2 leans a little harder on optimization, though the gap is small.
Call of Duty: Modern Warfare 2
Killstreak economy, loadout and map knowledge
WWE SmackDown! Shut Your Mouth
Move-set knowledge and momentum management are learnable
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.