head to head
System Shock 2 asks more than Middle-earth: Shadow of War, and the gap is optimization.

Optimization · Practiced Mastery
Nemesis-system sequel that adds orc army management and fortress sieges.

Optimization · Pure Optimization
An immersive-sim RPG demanding intricate build optimisation and resource management aboard a hostile alien-infested starship.
Middle-earth: Shadow of War leans Optimization (Practiced Mastery); System Shock 2 leans Optimization (Pure Optimization).
System Shock 2 leans a little harder on execution, though the gap is small.
Middle-earth: Shadow of War
Same counter-heavy combat as its predecessor
System Shock 2
Weapon degradation and limited stats moderate the raw aim ceiling
Middle-earth: Shadow of War leans a little harder on reads, though the gap is small.
Middle-earth: Shadow of War
Nemesis system mimics adaptation but follows knowable rules
System Shock 2
All enemies are scripted with fixed patrol and attack routines
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Middle-earth: Shadow of War
Random orc traits, betrayals, and fortress compositions
System Shock 2
Random loot locations and psi powers introduce run-to-run variance
System Shock 2 leans clearly harder on optimization.
Middle-earth: Shadow of War
Army building and siege planning layer on top
System Shock 2
Deep build tree and resource conservation define the entire skill ceiling
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.