Anybody who says Jigglypuff is a joke character and should be removed, be quiet, you obviously know nothing about Super Smash Brothers. All skilled players know that Jiggs can be a power house, just like many other characters, with the exceptions being Bowser, Pichu and Mewtwo, who are just too under developed. However a skilled player will beat the shit out of a newb with the lowest tier characters easily, so the point is moot. Why do people want to get rid of some of the more interesting characters? I personally say keep them all and keep adding more! More the better!
Another thing, They should keep all the clone characters but really go and make them more unique. Ganondorf for example, he deserves to be his own character for sure.