We call this game crouch and bubble in my house. We have been so addicted its unreal, played most of the game on multiplayer which is both amazingly fun and very frustrating in equal measure but unlike any gameplay ive played before in the way that you have to work together to complete levels.
The yoshis are an awesome part of the game we have played the first yoshi level a stupid amount of times and enjoy eating each other and then spitting people of cliffs or into enemies just for the fun of it.
The game is also very good on single player but its definately more fun on multiplayer, also if you are not so good at computer games if you die on multiplayer you come back in a bubble and your friends can save you so its good for all ability gamers.
The best game i have ever played on the wii for sure.