Exactly my point, never should one character be said to be superior to another.
Let's get one thing straight: Unless Nintendo itself releases a statistical report about every character in SSBM where they are ranked in strength accordingly in tiers every other report released before or afterwards is totally opinionated. There is no factual information proving Pichu is ranked the lowest in the tiers, and neither is it said that Fox or Marth are the best. The only reason some people would think that they are the highest is the fact that they are more appealing than other characters, and because of this they are more widely used than some other characters, such as Jigglypuff or G&W. I have met these such people before, and I beat them easily with G&W and Jigglypuff, coincidently, while they used, of course, Fox, Falco, Marth, and others to name a few.
How is Mewtwo statistically bad? Do you think his slowness and slipperiness account for that? Would you even stop to think that they may even help him in a good way? Or is it that his attacks are too hard to pull off at the right time?
Until Nintendo does specify who is the weakest and strongest in both SSB games don't just claim a character is weak or is statistically bad or is in this tier or that one. I'm pretty sure Nintendo has set itself apart from other gaming corporations so that it could prove how different their views are. Popular genres, like Fighting, are in abundance, and I would think Nintendo wouldn't have wanted to make another unbalanced game where one character was the best out of all the selectable characters. A good example of this is Soul Calibur, formerly known as Soul Blade. Mitsurugi, Ivy, and Cervantes were so overly powered that Namco balanced them out in SCII, stating themselves that every character in SCII was balanced now. So, until Nintendo does what Namco did with SCII all thoughts about SSB characters, in general, are opinionated, and, therefore, are not true.