head to head
Call of Duty: Modern Warfare 2 asks more than WWE '13, and the gap is execution.

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

Execution · Competitive PvP
Timing-based reversal duels with human mind-games layered on wrestling systems.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); WWE '13 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 '13
Reversal windows and move timing decide exchanges
Call of Duty: Modern Warfare 2 leans a little harder on reads, though the gap is small.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
WWE '13
Human opponents vary timing to bait reversals
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Modern Warfare 2
Spawn flips and killstreak randomness
WWE '13
Kick-out rolls and momentum swings add scripted chaos
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 '13
Knowing move-sets and match-type systems pays off
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.