head to head
Borderlands 2 asks more than Diablo IV, and the gap is execution.

Optimization · Systems & Chaos
Loot-shooter RPG built on gear chasing.

Optimization · Systems & Chaos
An ARPG loot grind about chasing affix rolls to feed a damage-stack build.
Borderlands 2 leans Optimization (Systems & Chaos); Diablo IV leans Optimization (Systems & Chaos).
Borderlands 2 leans clearly harder on execution.
Borderlands 2
Aim matters but generous hit feel
Diablo IV
Clicking and dodging are light; gear carries you.
Borderlands 2 leans a little harder on reads, though the gap is small.
Borderlands 2
Enemies are scripted loot fodder
Diablo IV
Enemies and bosses are scripted; no adaptive opponent.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands 2
Procedurally generated weapon drops vary
Diablo IV
Loot rolls, affixes, and uniques drive every session.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands 2
Skill trees and gear math heavily solved
Diablo IV
Paragon, aspects, and damage buckets are solvable theorycraft.
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.