I kind of agree that all Mario Parties are a pretty big waste of time, but I've never been a fan of party games in general (or the idea of a thing that just exists to help kill time/distract in a social situations). That type of "fun", without the charm/appreciation/craft/expressive/creative side of it being much of a factor seems kind of pointless to me, and when videogames are about that, I can do without the medium as a whole, personally.
That's just me, though. Something like the WarioWare games are another story altogether, though. Love that stuff.