head to head
Call of Duty: Modern Warfare 2 asks more than Knightfall: A Daring Journey, and the gap is execution.

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

Execution · Competitive PvP
A chaotic multiplayer horse-racing game testing control and prediction against human riders.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); Knightfall: A Daring Journey 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
Knightfall: A Daring Journey
Horse drifting and gun control demand precise input
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
Knightfall: A Daring Journey
Racing against human opponents rewards prediction
Knightfall: A Daring Journey leans a little harder on variance, though the gap is small.
Call of Duty: Modern Warfare 2
Spawn flips and killstreak randomness
Knightfall: A Daring Journey
Physics chaos adds unpredictable outcomes
Call of Duty: Modern Warfare 2 leans clearly harder on optimization.
Call of Duty: Modern Warfare 2
Killstreak economy, loadout and map knowledge
Knightfall: A Daring Journey
Route and shortcut knowledge help marginally
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.