head to head
SSX 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
High-speed trick execution along optimised lines down fixed mountains.
Half-Life 2 leans Execution (Pure Mechanics); SSX leans Execution (Pure Mechanics).
SSX leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
SSX
Trick timing, landings and line control at speed are everything
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Combine AI scripted, non-adaptive.
SSX
Rival AI racers are aggressive but mappable
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.
SSX
Courses are fixed once learned
SSX leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
SSX
Optimal trick lines and shortcut routing maximise score
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.