head to head
vs
Left 4 Dead 2vsMario Kart World
Left 4 Dead 2 leans Execution (Practiced Mastery); Mario Kart World leans Execution (Twitch Chaos).
Left 4 Dead 2Mario Kart World
Axis by axis
Execution6 vs 6
Even - both lean on execution about the same.
Reads3 vs 4
Mario Kart World leans harder on reads: Human racers bait items and contest lines in knockouts
Variance5 vs 6
Mario Kart World leans harder on variance: Item rolls and rubber-banding scramble any single race
Optimization6 vs 4
Left 4 Dead 2 leans harder on optimization: Route knowledge and weapon picks solvable
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.