head to head
World of Warcraft asks more than Portal 2, and the gap is reads.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
An MMORPG dominated by theorycraft, gear math, and rotation execution.
Portal 2 leans Optimization (Pure Optimization); World of Warcraft leans Optimization (Pure Optimization).
World of Warcraft leans clearly harder on execution.
Portal 2
Portal placement requires some precision but timing is lenient.
World of Warcraft
Rotation APM and mechanics matter in raids
World of Warcraft leans clearly harder on reads.
Portal 2
No opponent; puzzles are static.
World of Warcraft
PvP arenas have light read element
World of Warcraft leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
World of Warcraft
Loot tables and crit RNG present
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
Solving the puzzle's logic IS the entire game.
World of Warcraft
Gear, talents, and rotation are mathematically solved
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.