head to head
vs
Left 4 DeadvsMario Kart 7
Left 4 Dead leans Execution (Twitch Chaos); Mario Kart 7 leans Execution (Practiced Mastery).
Left 4 DeadMario Kart 7
Axis by axis
Execution7 vs 7
Even - both lean on execution about the same.
Reads2 vs 3
Mario Kart 7 leans harder on reads: Online lobbies reward anticipating rivals' items
Variance5 vs 4
Left 4 Dead leans harder on variance: AI Director randomizes hordes, items, and specials
Optimization5 vs 5
Even - both lean on optimization about the same.
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.