head to head
Far Cry 4 asks more than Metal Gear Solid 2: Substance, and the gap is execution.

Execution · Practiced Mastery
A Himalayan open-world shooter refining the outpost-clearing formula.

Optimization · Practiced Mastery
A stealth-action game where planning routes past scripted guards is the deep skill.
Far Cry 4 leans Execution (Practiced Mastery); Metal Gear Solid 2: Substance leans Optimization (Practiced Mastery).
Far Cry 4 leans clearly harder on execution.
Far Cry 4
Gunplay plus gyrocopter and elephant chaos
Metal Gear Solid 2: Substance
stealth timing and aim matter
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Far Cry 4
Scripted outpost AI
Metal Gear Solid 2: Substance
guards are scripted, no adaptation
Far Cry 4 leans a little harder on variance, though the gap is small.
Far Cry 4
Wildlife and patrol variation
Metal Gear Solid 2: Substance
minor patrol randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Far Cry 4
Outpost approaches and skill trees are plannable
Metal Gear Solid 2: Substance
stealth routes and gadgets 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.