Uh... yo. I'm El Shorpo, I'm the only active admin on the Vib-Ribbon Wiki (as of now), and I like Rhythm Heaven too. My favorite games in the series are Rhythm Tengoku and Rhythm Heaven Megamix.
Favorite/Least Favorite Games:
Rhythm Tengoku
Favorite: Night Walk, Least Favorite: Toss Boys
Rhythm Heaven
Favorite: Rhythm Rally, Least Favorite: Frog Hop
Rhythm Heaven Fever
Favorite: Figure Fighter, Least Favorite: Flock Step
Rhythm Heaven Megamix
Favorite: First Contact, Least Favorite: Animal Acrobat