Just saw this linked on gonintendo:
http://gonintendo.com/?p=45303
Apparently Sluggers supports wiimote-only control, NES pad-style sideways wiimote control, and wiimote + nunchuk control. This suggests that the complexity of the game is variable and you can have more or less control depending on your preference.
"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.