A whole lot of Kirby in one!
In the original game there was no real story to the game, besides a short, simple description of each activity, but now we get 3D cutscenes that kinda tie everything together, very loosely mind you. They are heavily compressed, but they look kinda neat, still, they add nothing to the overall experience.
Gameplay is just as every other Kirby game, you eat enemies and gain their powers, if they have one. Each power has a nice variety of skills, so that's pretty nice, and exclusive to Super Star Ultra, you can create an AI-Helper(Or player, if you are playing in Multiplayer) from the power you currently have. The game is, overall, pretty easy, but there's plenty of replay value, Kirby is just fun to play, plus there's plenty of optional goals in some of the games. Plus, the unlockable True Arena isn't easy at all.
Kirby Super Star Ultra is a fine little game to have on the go, but truth be told, I'd take a normal Kirby game over this one any day of the week.
7.5 out of 10