It's better to judge Wario World as a Treasure game more than a Nintendo game because besides the game having Wario as the main character everything else about it is Treasure to the core.

Wario World is one of the weaker games by Treasure for sure but it's still a good romp that has a lot of incentive for completionists but also doesn't overstay its welcome.

Like other reviews on this site have mentioned, the main issue holding this game back is its lack of focus. Wario World tries to carry itself on its beat em up style combat but the enemies and bosses are too basic and rigid for this approach to really work, and the mandatory fights that the game sprinkles throughout the levels feel tedious more than anything else. Wario World should have either been a fully-3D collectathon platformer or an entirely linear beat em up with more in depth combat mechanics and enemies to get closer to reaching its potential.