The thing about Kirby is that every Kirby game is different from it's brethren to a degree that is rarely seen in any video game series. That being said, to judge any single Kirby game based on the merits of its predecessors is sort of unfair.
Epic Yarn is a great game, and to despair upon it because it isn't as good as Kirby Super Star - a game which, by all respects, is entirely different save for the main character - is silly and meaningless.