head to head
WWF Royal Rumble asks more than Half-Life 2, and the gap is reads.

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

Execution · Pure Mechanics
Grapple-timing execution and mashing stamina in arcade wrestling matches.
Half-Life 2 leans Execution (Pure Mechanics); WWF Royal Rumble leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Gravity gun and shooting demand precision.
WWF Royal Rumble
Grapple timing and button mashing decide every lock-up
WWF Royal Rumble leans clearly harder on reads.
Half-Life 2
Combine AI scripted, non-adaptive.
WWF Royal Rumble
Human opponents add some habit prediction in versus
WWF Royal Rumble leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
WWF Royal Rumble
Little is hidden beyond grapple outcome wobble
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Linear progression with no builds.
WWF Royal Rumble
Move utility knowledge is a shallow solvable layer
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.