head to head
Halo 3 asks more than DOOM (2016), and the gap is reads.

Execution · Pure Mechanics
Push-forward arena FPS where movement and aim are the whole game.

Execution · Pure Mechanics
Trilogy capstone whose equal-start arena multiplayer defined a console generation.
DOOM (2016) leans Execution (Pure Mechanics); Halo 3 leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
DOOM (2016)
Aim, movement, glory-kill timing all peak.
Halo 3
Precision aim and grenade-melee timing
Halo 3 leans clearly harder on reads.
DOOM (2016)
Demons scripted attack patterns.
Halo 3
Equal-start fights reward predicting humans
Halo 3 leans a little harder on variance, though the gap is small.
DOOM (2016)
Minimal encounter randomness.
Halo 3
Equipment pickups and spawn variation
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
DOOM (2016)
Rune and weapon mod picks meaningful.
Halo 3
Power-weapon timers and map control
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.