head to head
Sin and Punishment asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.

Execution · Pure Mechanics
A relentless rail shooter testing aim and dodge execution against fixed choreography.
Half-Life 2 leans Execution (Pure Mechanics); Sin and Punishment leans Execution (Pure Mechanics).
Sin and Punishment leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Sin and Punishment
Simultaneous aiming, dodging and melee at relentless pace
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Sin and Punishment
Everything on rails is scripted, nothing adapts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Almost no randomness.
Sin and Punishment
Fixed enemy choreography every run
Sin and Punishment leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Sin and Punishment
Scoring routes and boss patterns are memorisable
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.