head to head
Fallout: New Vegas asks more than Metin2, and the gap is execution.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.

Optimization · Pure Optimization
An oriental-fantasy grind MMORPG where upgrade luck and farming efficiency define progress.
Fallout: New Vegas leans Optimization (Pure Optimization); Metin2 leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Metin2
Hack-and-slash grinding with simple inputs.
Metin2 leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Metin2
Kingdom wars add light player-versus-player conflict.
Metin2 leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Metin2
Upgrade chance rolls dominate gear progression.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Metin2
Farming spots, alchemy, and stat builds are solvable grind.
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.