head to head
Call of Duty: Modern Warfare 2 asks more than Mario Superstar Baseball, and the gap is execution.

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

Execution · Competitive PvP
Arcade baseball testing hit timing and pitch prediction in versus play.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); Mario Superstar Baseball 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
Mario Superstar Baseball
Bat timing and charged pitches are the core motor test
Call of Duty: Modern Warfare 2 leans clearly harder on reads.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
Mario Superstar Baseball
Guessing a human pitcher's mix is the versus layer
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
Mario Superstar Baseball
Star swings and bobbles add bounded randomness
Call of Duty: Modern Warfare 2 leans clearly harder on optimization.
Call of Duty: Modern Warfare 2
Killstreak economy, loadout and map knowledge
Mario Superstar Baseball
Chemistry pairings and lineups are quickly learned
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.