Execution.
The console is screaming for local multiplayer experiences, whether they're asymmetrical or not, and such experiences are scarcely to be found. Even upcoming Pikmin 3 has limited local multiplayer when it should have been a core feature.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.