IMO

Super Star/Ultra > Return to Dreamland > Squeak Squad > Star Allies > Triple Deluxe > Robobot I hated the robot, I don't know why > Dreamland 3 > Forgotten Land > 64 > Epic Yarn > Amazing Mirror > Adventure/Nightmare in Dreamland > Dreamland 2 > Dreamland

Not a single Kirby game is bad, but just like Metroid and Zelda, the series peaked on the SNES.