I liked WW for the GBA, it was ultimitely the reason why I upgraded to the SP. I do not own a DS yet, As soon as I go the the store, I'll look into it.
The only multiplyer that WW (GBA) had involved two people holding the same GBA, one uses the L button, the other used R button.
WW is a bunch of microgames that are played in order to pass the time (ideal for a handheld), I acually laughed when they released it for GCN.