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
Arcade hockey reflexes with light shot-angle guessing against human opponents.

Execution · Pure Mechanics
A heavyweight sci-fi FPS pitting ISA soldiers against the Helghast with famously weighty gunfeel.
Blades of Steel leans Execution (Pure Mechanics); Killzone 2 leans Execution (Pure Mechanics).
Killzone 2 leans a little harder on execution, though the gap is small.
Blades of Steel
Skating, passing and shot timing decide every rush
Killzone 2
Weighty gunplay punishes imprecise aim hard
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Blades of Steel
Versus a human, goalie duels become guessing games
Killzone 2
Multiplayer opponents adapt; campaign AI doesn't
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Blades of Steel
Fights and bounces add small arcade chaos
Killzone 2
Modest spawn and objective rotation noise
Killzone 2 leans a little harder on optimization, though the gap is small.
Blades of Steel
Angle exploits on the goalie are quickly mapped
Killzone 2
Class unlocks and map control are learnable
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.