head to head
Grand Theft Auto IV asks more than Dash of Destruction, and the gap is execution.

Execution · Light / Casual
A deliberately trivial chase advergame testing only basic steering.

Execution · Practiced Mastery
A grittier crime story where weighty driving and gunplay carry the experience.
Dash of Destruction leans Execution (Light / Casual); Grand Theft Auto IV leans Execution (Practiced Mastery).
Grand Theft Auto IV leans clearly harder on execution.
Dash of Destruction
Simple steering is the only demand, deliberately easy
Grand Theft Auto IV
Heavier driving and cover shooting reward control.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dash of Destruction
Chase AI barely reacts; local human play adds a sliver
Grand Theft Auto IV
Scripted AI, no adaptive opponent modeling.
Grand Theft Auto IV leans a little harder on variance, though the gap is small.
Dash of Destruction
City layouts are fixed and tiny
Grand Theft Auto IV
Minor mission variance.
Grand Theft Auto IV leans a little harder on optimization, though the gap is small.
Dash of Destruction
Routes are learned in minutes by design
Grand Theft Auto IV
Mission routing and weapon picks 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.