My opinions on that chart:
Sheik v Puff is definitely +1 Sheik. Sheik is probably the character capable of knocking puff down in the metagame. Back air is basically win, and sheik doesn't die at low percentages very commonly.
Fox v Samus being even is pretty ridiculous. Where are the samus players knocking fox players out of tournaments? I sure haven't seen it.
I also feel like Falco v Samus is probably slightly in Falco's favor.
I still think Marth-Falco is like 52-48, but that's pretty close to even for the purposes of the chart.
Marth even with Ganondorf? Uh, I really doubt this.
I'm thinking Falcon-Jiggs is even, but I don't know much about that matchup.
I think Luigi should be -1 instead of -2 in a lot of matchups, but he's quite underrated.
It is also necessary to add a category for Taj's Mewtwo.
That's all I've got to say really.