head to head
Grand Theft Auto V asks more than Doom 3, and the gap is reads.

Execution · Practiced Mastery
A slow horror-leaning Doom reboot built on darkness and scripted ambushes.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Doom 3 leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Doom 3
Closet ambushes punish slow target acquisition
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans clearly harder on reads.
Doom 3
Demon spawns are scripted triggers, not adaptation
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Doom 3 leans a little harder on variance, though the gap is small.
Doom 3
Darkness hides ambushes until memorised
Grand Theft Auto V
Some mission and lobby randomness.
Doom 3 leans a little harder on optimization, though the gap is small.
Doom 3
Ammo management and trigger knowledge trivialise replays
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.