Peach's meta game came has improved and went up more than sonics, and it still is, Peach has come a long way to the point where she is now going even with Snake. And is getting on that same road with meta. If you would see the topics in the Peach area, you would see the hard work all is doing for that character.
I don't deny that. Peach is definitely moving in the right path, and I expect her to move up the tiers a bit too. She warrants 11th position in that list of recent tourneys.
Also, not saying that you were referring to this, but Sonic mains put in a lot of hard work too. Its just masked by all the goofyness =P.
I think one of the admirable thing about the Sonic boards is that seeing as so many of us are 08ers, and we're starting to do better, it just shows not only a bettering of the character himself, but of us as smashers, perhaps more so than the other boards. We also don't exactly have a very notable player who has been well known since melee, like several other boards do. We don't have clear players we can declare the best, partly because there are so few of us. Some of the ones that are the best smashers have among the lowest technical know-how about Sonic. Basically, the Sonic community is starting from the ground up.
Match-up wise, I say Sonic goes even or near even with snake. Several other Sonic may agree, others may disagree(Sonic can really make lots of snakes options much less effective). Oh well =P. I don't think the meta match-up is too bad either, but the large majority will disagree. Not that it matters much, as it seems he'll be banned, as much as I don't want him too =P
By the way, I think mario has a lot of potential. I think he belongs in mid tier personally. Mario has always been in mid tier anyways. His name starts with an "M". And he's still what he's always been, a balanced character. =P
Mewto and Roy for extinct tier.