head to head
Unreal Tournament III 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
High-speed arena shooter with twitch duels and warfare-scale vehicle modes.
Half-Life 2 leans Execution (Pure Mechanics); Unreal Tournament III leans Execution (Pure Mechanics).
Unreal Tournament III leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Unreal Tournament III
Hitscan precision, dodge timing, and vehicle handling rule fights
Unreal Tournament III leans clearly harder on reads.
Half-Life 2
Combine AI scripted, non-adaptive.
Unreal Tournament III
Human opponents vary routes and dueling habits
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.
Unreal Tournament III
Open arenas with fully visible pickups and players
Unreal Tournament III leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Unreal Tournament III
Weapon spawns and power-up timing reward map study
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.