head to head
Super Mario Galaxy 2 asks more than Grand Theft Auto: San Andreas, and the gap is execution.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.

Execution · Practiced Mastery
A 3D platformer about precise gravity-bending jumps through fixed galaxies.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Super Mario Galaxy 2 leans Execution (Practiced Mastery).
Super Mario Galaxy 2 leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Super Mario Galaxy 2
Precise jumps and gravity navigation define every galaxy
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Super Mario Galaxy 2
Bosses are scripted patterns, not adapting to you
Grand Theft Auto: San Andreas leans a little harder on variance, though the gap is small.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Super Mario Galaxy 2
Levels are deterministic, nothing random
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Super Mario Galaxy 2
Learning fixed layouts and routes for stars
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.