head to head
Call of Duty: World at War asks more than Grand Theft Auto V, and the gap is execution.

Execution · Practiced Mastery
A gritty WWII Call of Duty that introduced the Zombies mode.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Call of Duty: World at War leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Call of Duty: World at War leans clearly harder on execution.
Call of Duty: World at War
Twitch gunfights in fast multiplayer lobbies
Grand Theft Auto V
Driving and shooting demand decent inputs.
Call of Duty: World at War leans a little harder on reads, though the gap is small.
Call of Duty: World at War
Human opponents reward positioning prediction
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Call of Duty: World at War leans a little harder on variance, though the gap is small.
Call of Duty: World at War
Random lobbies, spawns, and zombie waves
Grand Theft Auto V
Some mission and lobby randomness.
Call of Duty: World at War leans a little harder on optimization, though the gap is small.
Call of Duty: World at War
Perk loadouts and map control are learnable
Grand Theft Auto V
Heists, money loops, builds learnable.
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.