head to head
Grand Theft Auto V asks more than Dark Sector, and the gap is reads.

Execution · Practiced Mastery
Precision glaive throws against scripted enemies in a cover shooter frame.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Dark Sector leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Dark Sector leans a little harder on execution, though the gap is small.
Dark Sector
Glaive throws with manual curve control reward precise aim
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans clearly harder on reads.
Dark Sector
Infected enemies follow fixed behaviour scripts
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Dark Sector
Encounters replay identically once learned
Grand Theft Auto V
Some mission and lobby randomness.
Dark Sector leans a little harder on optimization, though the gap is small.
Dark Sector
Power usage and upgrade choices reward planning
Grand Theft Auto V
Heists, money loops, builds 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.