Gamorium's take

Memorising spawn patterns then executing them flawlessly under one-hit-death rules.
the cheat-test profile
Each axis is rated on its own - how far one cheat would trivialize the game here. They don't trade off; low on all four means the game is an experience, not a contest.
cheat: Aimbot - perfect inputs
One-hit deaths demand precise dodging and constant accurate fire
cheat: Out-predict an adaptive opponent
Alien waves follow fixed spawn scripts
cheat: See what's hidden / map the RNG
Nothing random once spawn patterns are memorised
cheat: A perfect solver / coach
Memorising spawns and weapon routes is half the run
Each axis is named by the cheat that would break the game along it. Execution is the hands. Reads is out-thinking an adaptive opponent. Variance is hidden information & RNG. Optimization is the solvable systems layer. A game's region is the top one or two axes.
These four aren't one rating split four ways - they're independent 0-10 questions. A 9 on one axis takes nothing from the others, and a game low on all four isn't missing data: it's telling you there's no skill here to cheat.
The basis is how the majority actually plays this game - not a niche mode or a personal run. For a game with very different modes (a story campaign versus ranked multiplayer), that's the version most people mean.
Ranked by shared genre first, then by how closely the cheat-test profile matches - a cross-genre tag means a pick matched on skill profile alone.