head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Pure Mechanics
Sequel continuing the Alma horror story with mech sequences and slow-motion combat.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
F.E.A.R. 2: Project Origin leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
F.E.A.R. 2: Project Origin leans a little harder on execution, though the gap is small.
F.E.A.R. 2: Project Origin
Aim and slow-mo trigger discipline
Half-Life 2
Gravity gun and shooting demand precision.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
F.E.A.R. 2: Project Origin
Enemy squads are clever but scripted
Half-Life 2
Combine AI scripted, non-adaptive.
F.E.A.R. 2: Project Origin leans a little harder on variance, though the gap is small.
F.E.A.R. 2: Project Origin
Minor spawn and cover variation
Half-Life 2
Almost no randomness.
F.E.A.R. 2: Project Origin leans a little harder on optimization, though the gap is small.
F.E.A.R. 2: Project Origin
Learning arenas and ability usage
Half-Life 2
Linear progression with no builds.
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.