head to head
Call of Duty: Modern Warfare 2 asks more than Star Wars: Battlefront II, and the gap is execution.

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

Execution · Competitive PvP
Large-battle aim and positioning with light prediction against human players.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); Star Wars: Battlefront II 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
Star Wars: Battlefront II
Aimbot dominates infantry fights and starfighter dogfights
Call of Duty: Modern Warfare 2 leans clearly harder on reads.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
Star Wars: Battlefront II
Human opponents in multiplayer create modest prediction play
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
Star Wars: Battlefront II
Spawns, vehicle availability and hero pickups add 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
Star Wars: Battlefront II
Class choice and map control reward learned plans
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.