head to head
Left 4 Dead asks more than Condemned: Criminal Origins, and the gap is execution.

Execution · Practiced Mastery
First-person horror thriller built on brutal improvised-weapon melee.

Execution · Twitch Chaos
Co-op zombie shooter whose AI Director reshuffles every run to keep teams honest.
Condemned: Criminal Origins leans Execution (Practiced Mastery); Left 4 Dead leans Execution (Twitch Chaos).
Left 4 Dead leans clearly harder on execution.
Condemned: Criminal Origins
Visceral melee blocking and counter timing
Left 4 Dead
Headshots, melee shoves, and special-infected reaction time
Left 4 Dead leans a little harder on reads, though the gap is small.
Condemned: Criminal Origins
Enemies ambush but follow simple scripts
Left 4 Dead
Versus mode adds human ambush mindgames
Left 4 Dead leans a little harder on variance, though the gap is small.
Condemned: Criminal Origins
Unpredictable ambushes on a first playthrough
Left 4 Dead
AI Director randomizes hordes, items, and specials
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Condemned: Criminal Origins
Weapon choice and level knowledge converge
Left 4 Dead
Team spacing, route choice, and resource discipline
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.