head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Practiced Mastery
An endless-runner shooter testing steering and aim against zombie crowds.

Optimization · Practiced Mastery
Open-world action game where procedurally generated orc captains remember your encounters.
Into the Dead 2 leans Execution (Practiced Mastery); Middle-earth: Shadow of Mordor leans Optimization (Practiced Mastery).
Into the Dead 2 leans a little harder on execution, though the gap is small.
Into the Dead 2
Steering and aiming while auto-running drives survival
Middle-earth: Shadow of Mordor
Counter-timing combat and stealth execution
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Into the Dead 2
Zombies shamble on scripts, no prediction
Middle-earth: Shadow of Mordor
Nemesis orcs remember you but remain mappable scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Into the Dead 2
Spawn placement and pickup drops vary each run
Middle-earth: Shadow of Mordor
Procedural captains with hidden strengths and weaknesses
Middle-earth: Shadow of Mordor leans a little harder on optimization, though the gap is small.
Into the Dead 2
Weapon loadout and upgrade choices reward planning
Middle-earth: Shadow of Mordor
Intel gathering and exploiting known weaknesses solves fights
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.