While B tier is by no means bad, Mario doesn't have the major weaknesses of the other characters in the same tier (Ike - projectiles, Ness - shielding, Sonic - hitbox priority) outside of lack of disjoint, and this is largely circumvented by his fireballs and decent mobility
Worth mentioning that Ike is also weak to well-spaced dash dancing: spacing yourself just outside of his sword's range and too close for him to safely charge QD makes him very uncomfortable. Ike's strengths (bar recovery) lie in primarily three things:
1) QD Movement/follow-ups
2) Big range, heavy-hitting sword
3) Great conversions off of grab (Glad we can't hear people ask for release point buffs anymore amirite?)
Obviously being outside of Ragnell's range means you're ungrabable as well. All you have to do is wait. Ike's sword is heavy, and there's quite a bit of start-up and/or endlag on all of his moves. This means that as soon as he whiffs something, you can punish. Ergo, Ike is weak to good dash dancing too.
As for Sonic, I can safely say that the Sonic community as a whole thinks that a simple cleaning up (akin to 20GX I suppose), along with some clever exploration of his depth, is enough to circumvent any of his weaknesses against defensive walls in general no matter what their origin is. I will concede and say Mario is possibly better than Sonic, if his match ups against supposed top tiers remain to be seen as better than Sonic's are now, who struggles against Fox, Wolf and MK (as well as Falcon [optimized], Marth, and Samus). However, it's worth noting that at least atm, the outlook for Sonic is strong endgame-wise. If you know the match up, the better player will win. Straight up, bar the five match ups I listed Sonic's spread is very very flat.
In that facet, if Sonic loses to hitbox priority, so does Mario since he's so stubby. Okay, maybe that's not true, but Sonic is able to circumvent this problem theoretically with sick movement and sick movement only.
let the games begin
maybe some day i can convince you people to stop putting kirby in the bottom 5 >_<
Good luck with that. If anything, I see Kirby's effectiveness diminishing in PM's future meta game, since people'll be able to adapt to his gimmicks maybe and Kirby doesn't do spectacularly against Fox/Wolf/MK/Diddy/Rob anyways.
Although it'll always be funny to see Kirby wreck Sheik, Ike, ZSS and Ganon (?) lol. Especially Sheik, Ms. Low Tier Slayer herself, circa Melee. Quite the reversal, don't you think?
Edit:
X
xquqx
Just watch him. Watch him go, slip under the door, gobble him faster than a fat kid (Ness) on a Smartie, waddle to the ledge, and tumble off into oblivion. Pure, raw beauty.