head to head
Serious Sam's Bogus Detour 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 top-down shooter testing aim and movement against relentless enemy hordes.
Half-Life 2 leans Execution (Pure Mechanics); Serious Sam's Bogus Detour leans Execution (Pure Mechanics).
Serious Sam's Bogus Detour leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Serious Sam's Bogus Detour
Top-down aiming and crowd-dodging are the lead
Serious Sam's Bogus Detour leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Serious Sam's Bogus Detour
Enemy hordes follow scripted rushes, not adaptive
Serious Sam's Bogus Detour leans clearly harder on variance.
Half-Life 2
Almost no randomness.
Serious Sam's Bogus Detour
Spawn timing and drops add some chaos
Serious Sam's Bogus Detour leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Serious Sam's Bogus Detour
Weapon choice and arena positioning matter underneath
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.