Well, them Wario games ain't easy either. :-/
I got to the Allergia Garden in that Master of Disguise, though.
Didn't get far with Wario Land 4 though.
Plus Radiant Historia has a remake for 3DS ("Perfect Chronology")...
I agree with you there: I completed Wario Land 4 and Wario: Master of Disguise, though both of them had their difficulties. Wario Land 4 does get quite tense once you're doing the escape sequences; the music really helps to set the mood.
Wario: Master of Disguise does get quite difficult with the puzzles at times. The final level Allegra Gardens is difficult as hell and the final boss is quite the challenge. But hey, at least you got past the footrace with Carpaccio (man that was tough).
So regarding Henry Hatsworth, how far did you get? And have you played any of the secret levels?