head to head
Helldivers 2 asks more than Red Dead Redemption 2, and the gap is variance.

Optimization · Practiced Mastery
Top-tier co-op shooter against bug and bot hordes.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.
Helldivers 2 leans Optimization (Practiced Mastery); Red Dead Redemption 2 leans Execution (Practiced Mastery).
Helldivers 2 leans a little harder on execution, though the gap is small.
Helldivers 2
Recoil, stratagem inputs, friendly-fire aim
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Helldivers 2 leans a little harder on reads, though the gap is small.
Helldivers 2
Enemies scripted, no adaptive opponent
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Helldivers 2 leans clearly harder on variance.
Helldivers 2
Patrol spawns and modifiers shake missions
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Helldivers 2 leans clearly harder on optimization.
Helldivers 2
Loadout and stratagem synergies deep
Red Dead Redemption 2
Loadouts and routes solvable but loose.
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.