head to head
vs
Grand Theft Auto IVvsHalf-Life 2
Grand Theft Auto IV leans Execution (Practiced Mastery); Half-Life 2 leans Execution (Pure Mechanics).
Grand Theft Auto IVHalf-Life 2
Axis by axis
Execution5 vs 6
Half-Life 2 leans harder on execution: Gravity gun and shooting demand precision.
Reads1 vs 1
Even - both lean on reads about the same.
Variance2 vs 1
Grand Theft Auto IV leans harder on variance: Minor mission variance.
Optimization3 vs 3
Even - both lean on optimization about the same.
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.