Warioware DIY was the first Warioware game I owned for myself and it helped me get into the Wario Land series by extension.
It's a pretty fun game, has a lot of replay value (more so than the other games) and just overall it's just fun to work on your own microgames / comics / music. Although I could never do music.
Pretty good game, best song level in the Warioseries (more so than Ashley).
I just don't like that it got split into two games, I have Warioware DIY on my Wii now but it still doesn't make it any better.