head to head
Call of Duty: Modern Warfare 2 asks more than Medal of Honor: Warfighter, and the gap is execution.

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

Execution · Competitive PvP
A military shooter testing aim with moderate prediction of human opponents online.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); Medal of Honor: Warfighter 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
Medal of Honor: Warfighter
Gunfights reward aim in both campaign and multiplayer
Call of Duty: Modern Warfare 2 leans clearly harder on reads.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
Medal of Honor: Warfighter
Human opponents in multiplayer demand positional 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
Medal of Honor: Warfighter
Spawns and engagements add modest unpredictability
Call of Duty: Modern Warfare 2 leans clearly harder on optimization.
Call of Duty: Modern Warfare 2
Killstreak economy, loadout and map knowledge
Medal of Honor: Warfighter
Class loadouts and map knowledge form a thin 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.