I'd say Shake It is the closest one for disappointing. I replayed it a couple months ago and It just felt slow and just not as fun as I remembered it.
It's a shame we didn't get a new Wario Land in the DS/3DS era. It feels like such a wasted...
Wario Land Shake It is okay but doesn't feel like a worthy successor to 4. The only unique thing it has going for it is it looks pretty.
Lately I've been thinking that it would be nice to see it remastered at least but I kinda doubt they still...