head to head
Call of Duty: Modern Warfare 2 asks more than WCW/nWo Revenge, and the gap is execution.

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

Execution · Competitive PvP
AKI-engine N64 wrestler that perfected the grapple system later refined in No Mercy.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); WCW/nWo Revenge 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
WCW/nWo Revenge
AKI grapple timing and reversal windows
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
WCW/nWo Revenge
Human opponents turn reversals into prediction duels
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
WCW/nWo Revenge
Slight randomness in momentum swings
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
WCW/nWo Revenge
Learning rosters' move sets and spirit flow converges
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.