Yoshi used to be the only charicter I used. I think that Capt. Falcon has powerful attacks, but the're so slow (They take so long to power up), other charicters usually hit him before he even attacks.
I think Bowser and D.K. have major disadvantages. So does Peach. Bow and D.K. are slow, have slow attacks, and although the're attacks look strong, some of the other non-uber charicters attacks are stronger!
And Peach doesen't even deserve this paragraph. She's slow, she's weak, and the only thing cool about her is that she has an umbrella! (HAHA! That wasen't even a whole paragraph!) "Princess Peach. i can actually pull off that move she does in the movie." What move? Hmm...
But that doesen't mean the other girls are weak. Personally, I can kick butt with Shiek/Zelda, and although I don't like her, I know that Saumus has wonderful long-range attacks, and not to mention her speed. And her other attacks are quite powerful.
Lets see... I don't quite know. Are the only uber charicters the unlockable ones! The ones you have to unlock to fight with? Or are some normal charries uber too? O___O Is Meta a charicter you can unlock?