Kirby Canvas Curse is the most underrated DS game ever.
It made full use of the touch-screen, did it well with incredibly innovative controls, had classic Kirby level design, tons of secrets and unlockables, and was one of few games that made having a second screen as a map feel like a true necessity. Not to mention the dangerously fun boss battles.
But enough of that rant.
Wario and WiiPlay are definitly mini-game collections but Mario Party is a little different.
I'd say it's more of a party/board game. Let's not forget Secret Rings either. Looks like it could be the best Sonic console game in generations. And I've heard it has a mini-game collection too for all you mini-game whores.