head to head
Helldivers 2 asks more than Grand Theft Auto: San Andreas, and the gap is variance.

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

Optimization · Practiced Mastery
Top-tier co-op shooter against bug and bot hordes.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Helldivers 2 leans Optimization (Practiced Mastery).
Helldivers 2 leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Helldivers 2
Recoil, stratagem inputs, friendly-fire aim
Helldivers 2 leans clearly harder on reads.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Helldivers 2
Enemies scripted, no adaptive opponent
Helldivers 2 leans clearly harder on variance.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Helldivers 2
Patrol spawns and modifiers shake missions
Helldivers 2 leans a little harder on optimization, though the gap is small.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Helldivers 2
Loadout and stratagem synergies deep
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.