So I recently played and beat Wario Land 2 & 3 for the first time and I found them both to be quality titles that compare pretty equally with their own ups and downs.
Now I've started Wario Land 4 and only a couple levels in, this games on a whole different level. This is like the jump from the first Smash Brothers to Melee: huge improvements if every aspect. Sprites are better animated and more colorful, improved mechanics and movement, and, best of all, the music is finally up to par with the rest of the game, which I felt were 2 and 3's weakest aspect. The only thing bogging it down is that I've played a fuckton of WarioWare, so I can see how many sound assets they recycled from this. Man I wish I played this when I was a kid.
Wario thread.
I love Wario Land 4 because it's about a fat greedy asshole and yet somehow it manages to be the most stylish and cool game that Nintendo ever made.