head to head
The First Descendant asks more than System Shock 2, and the gap is variance.

Optimization · Pure Optimization
An immersive-sim RPG demanding intricate build optimisation and resource management aboard a hostile alien-infested starship.

Optimization · Practiced Mastery
A co-op third-person looter shooter where module build optimisation and drop variance define long-term progression.
System Shock 2 leans Optimization (Pure Optimization); The First Descendant leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
System Shock 2
Weapon degradation and limited stats moderate the raw aim ceiling
The First Descendant
Colossus boss fights and intercept missions require dodge timing and aim
The First Descendant leans a little harder on reads, though the gap is small.
System Shock 2
All enemies are scripted with fixed patrol and attack routines
The First Descendant
PvE co-op throughout with no meaningful adaptive opponent
The First Descendant leans clearly harder on variance.
System Shock 2
Random loot locations and psi powers introduce run-to-run variance
The First Descendant
Module drop RNG and Descendant unlock rates drive the grind
System Shock 2 leans a little harder on optimization, though the gap is small.
System Shock 2
Deep build tree and resource conservation define the entire skill ceiling
The First Descendant
Module builds and Descendant loadouts are extensively theory-crafted
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.