head to head
Bulletstorm asks more than Grand Theft Auto: San Andreas, and the gap is execution.

Execution · Practiced Mastery
An arcade FPS that scores you for killing enemies in the most creative ways possible.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.
Bulletstorm leans Execution (Practiced Mastery); Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery).
Bulletstorm leans clearly harder on execution.
Bulletstorm
Leash, kick, and shot timing drive skillshot chains
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Bulletstorm leans a little harder on reads, though the gap is small.
Bulletstorm
Enemies are scripted fodder for your combos
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Bulletstorm
Arenas and spawns are fixed and learnable
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Bulletstorm
Maximising skillshot score per arena is a solvable puzzle
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
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.