I'm going with yoshi on this one, even if I am a kirby fanboy.
I'mean kirby has become very repeditive, I like coping enemies and such, but absolutely no platformer kirby game was ever a challenge for me, which is bad since I love platformers for some reasion. o.o
Yoshi's games however (Exluding yoshi's story) are probobly the most anoying, yet addictive games I've ever played, the only bad thing is...I kinda have <spoiler>over 100 lives</spoiler>.