head to head
Call of Duty: Infinite Warfare asks more than Half-Life 2, and the gap is reads.

Execution · Pure Mechanics
A space-faring Call of Duty mixing jetpack multiplayer with a starfighter campaign.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Call of Duty: Infinite Warfare leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Call of Duty: Infinite Warfare leans clearly harder on execution.
Call of Duty: Infinite Warfare
Wall-running and thrust jumps demand mechanical skill
Half-Life 2
Gravity gun and shooting demand precision.
Call of Duty: Infinite Warfare leans clearly harder on reads.
Call of Duty: Infinite Warfare
Human opponents reward movement prediction
Half-Life 2
Combine AI scripted, non-adaptive.
Call of Duty: Infinite Warfare leans clearly harder on variance.
Call of Duty: Infinite Warfare
Spawn logic and lobby variance add noise
Half-Life 2
Almost no randomness.
Call of Duty: Infinite Warfare leans clearly harder on optimization.
Call of Duty: Infinite Warfare
Rig choice and movement routes are solvable
Half-Life 2
Linear progression with no builds.
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.