Sorry if this is considered a bump, but I just got WarioWare DIY recently. Personally, I'm indifferent about it. I do like the Story Stages.
Mona Temple Explorer: Not all that interesting, but it does it's job as a first stage.
Jimmy's Dance Aerobics: I like this stage. It's weird and creative. That disco theme is way too catchy, though. The boss stage also seems to rely more on luck than skill.
Ashley The Little Witch: I like this one two. I haven't played a game with Ashley in it yet, but I do like the character. I really like that little gremlin that follows her too, I think he's pleasantly cute. Also, I like the simple, spooky theme to the stage.
Orbulon on TV News: This one is crazy weird! ...But that's kind of its charm, too. Plus, unlike the stages in the first Wario Ware game, Orbulon's games are actually challenging this time. I thought his stages in the original Wario Ware were too easy.
Super 9-Volt: This one is probably my least favorite stage. First off, the Super Mario themed stage would have fit better in an older game. Possibly in the first game, where it could have been used instead of the Dragon Quest style stage(Nintendo doesn't even OWN Dragon Quest). Why? By now an ode to Super Mario Brothers just seems old and outdated. It would have seemed more fresh in an older game. Also some of his games feel like they have bad hit detection. I REALLY dislike the Balloon Fight game, whose difficulty is either mild or unfair, especially when the stars bunch up so close together that flying between them is almost impossible.
The designing aspect of this game also could have been better. You can only make games where you tap, you can't make any games where you can drag the stylus on the screen. That would have made the game more fun to me. Also, I keep forgetting one big thing: Playing games is usually a lot more fun than making them.