It's very much the charm of playing in groups of four whether that's with other real players locally or against the AI that was so appealing and enjoyable. (gamerheadquarters.com)
Before players can take on other real players in multiplayer battles, they must play training games against the computer until they reach level seven. (adweek.com)
It's not essential, but it is nice to see other real players in a game one way or another... At least IMO. (nintendonuggets.com)