I am looking for an iOS game that's similar to WarioWare. The only one that I know of is A.D.D.- Addictive Dumb Distractions.
In addition to ADD (of which you already know about), I've heard NOM: Billion Year Timequest by Gamevil compared to it before. I can't guarantee that as I have not played it though.
I have a few of these kinds of games. Try Minigame Party, Crazy Test, or 7 Second Arcade. You could also look at 101-in-1 Games. It's not really Wario-like but it's still fun. It's loaded with minigames that you unlock as you go, and they have added extra ones over the last couple of updates.
The closest thing I can think of would be Pix N' Rush (although they are not minigames, but mini-stages with different objectives). It's a pretty good game too, so I'd recommend that.