head to head
Call of Duty: Black Ops asks more than Mario Power Tennis, and the gap is execution.

Execution · Competitive PvP
Cold War-era shooter pairing twitch multiplayer with the cult Zombies mode.

Execution · Competitive PvP
Timing-based rallies and human shot-prediction wrapped in party-court chaos.
Call of Duty: Black Ops leans Execution (Competitive PvP); Mario Power Tennis leans Execution (Competitive PvP).
Call of Duty: Black Ops leans clearly harder on execution.
Call of Duty: Black Ops
Gunfights hinge on aim and reaction speed
Mario Power Tennis
Shot timing and court positioning decide rallies
Call of Duty: Black Ops leans a little harder on reads, though the gap is small.
Call of Duty: Black Ops
Reading human opponents' positioning and timing
Mario Power Tennis
Versus humans, baiting and outguessing shot placement matters
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Black Ops
Spawns, care packages, zombies RNG
Mario Power Tennis
Gimmick courts and items inject chaos into points
Call of Duty: Black Ops leans clearly harder on optimization.
Call of Duty: Black Ops
Class builds, map control, zombies routing
Mario Power Tennis
Character matchups and shot selection reward modest study
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.