Sonic Shuffle is good, but if you don't have friends it gets repetitive. Awesome mini-games though and the board parts are much better than the sluggish Mario Party, it's more tactical as well.
If you don't already have it get Jet Set Radio, you won't be dissapointed.
Also PSO V2 is basically V1 with different stages, its kinda crap actually, V1 is much better.