head to head
Quake Champions 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
Classic arena aim married to champion abilities, tested against adaptive human opponents in fast duel maps.
Half-Life 2 leans Execution (Pure Mechanics); Quake Champions leans Execution (Pure Mechanics).
Quake Champions leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Quake Champions
Champion abilities add execution layers on top of classic rail and rocket aim
Quake Champions leans clearly harder on reads.
Half-Life 2
Combine AI scripted, non-adaptive.
Quake Champions
Human duels require reading opponent ability usage and positioning
Quake Champions leans clearly harder on variance.
Half-Life 2
Almost no randomness.
Quake Champions
Ability cooldowns introduce mild timing uncertainty per match
Quake Champions leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Quake Champions
Champion matchup knowledge and item timing are solvable advantages
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.