I love Wario Land 3. It's such an ambitious, bizarre mixup of Nintendo franchises, what with the platforming, puzzles, and non-linearity. I'm currently playing through WL2, after which I'll probably revisit it. My current feeling is that Wario Land 3 was a huge improvement.

Yeah, the leap from Wario Land 2 to Wario Land 3 really impressed me when I was a kid. It's probably my favorite game on the Game Boy Color.

With the exception of Virtual Boy Wario Land, I've enjoyed each Wario Land game more than its predecessor. I say that as a fan of every game in the series!