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

Execution · Pure Mechanics
A futuristic Call of Duty whose exoskeleton boosts made aerial movement king.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Call of Duty: Advanced Warfare leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Call of Duty: Advanced Warfare leans clearly harder on execution.
Call of Duty: Advanced Warfare
Exo boost-dodging raises the mechanical ceiling sharply
Half-Life 2
Gravity gun and shooting demand precision.
Call of Duty: Advanced Warfare leans clearly harder on reads.
Call of Duty: Advanced Warfare
Predicting human boost paths wins gunfights
Half-Life 2
Combine AI scripted, non-adaptive.
Call of Duty: Advanced Warfare leans clearly harder on variance.
Call of Duty: Advanced Warfare
Spawns and supply-drop loot add randomness
Half-Life 2
Almost no randomness.
Call of Duty: Advanced Warfare leans clearly harder on optimization.
Call of Duty: Advanced Warfare
Movement tech and class builds are learnable
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.