16 minigames? I get more than that out of Mario Party, and more microgames than that out of WarioWare. This seems more like Nintendo Land or Wii Play than anything else, which is a bad thing indeed.
There's also the issue of the metagame. Mario Party wraps its minigames in a board game, which adds a TON of depth in spite of being fairly basic and mostly just existing to give the minigames context. WarioWare, in addition to having MORE microgames in each entry, divides them into smaller collections that need to be completed in order to unlock more. It might seem like a small thing, but making the smaller minigames or microgames in other collections part of a much bigger whole is the biggest reason these games are so much better than most third-party minigame collections. It's sad to see Nintendo dropped the ball in this regard; just adding depth (or even multiple stages) to minigames does not make up for a disconnected overall experience.
P.S. Thanks