head to head
Serious Sam: The Second Encounter asks more than Red Dead Redemption 2, and the gap is execution.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.

Execution · Practiced Mastery
An over-the-top horde shooter throwing hundreds of charging enemies at you.
Red Dead Redemption 2 leans Execution (Practiced Mastery); Serious Sam: The Second Encounter leans Execution (Practiced Mastery).
Serious Sam: The Second Encounter leans clearly harder on execution.
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Serious Sam: The Second Encounter
Circle-strafing huge horde waves tests stamina and aim
Red Dead Redemption 2 leans a little harder on reads, though the gap is small.
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Serious Sam: The Second Encounter
Enemies charge in fixed patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Serious Sam: The Second Encounter
Wave compositions memorised after one run
Serious Sam: The Second Encounter leans clearly harder on optimization.
Red Dead Redemption 2
Loadouts and routes solvable but loose.
Serious Sam: The Second Encounter
Prioritising targets and managing arenas is solvable
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.