MK wins by a decent margin IMO, I don't consider Snake to be MK's worst (non-MK) MU either, I think at the very least Diddy and IC's are better off.
No way. Snake, Diddy and the ICs all do equally well against MK, imo. I'd say Snake beats MK onstage. Forces him to approach, deals massive damage upon approaching (solid guaranteed 12 for a grab + high chance of followups, 21 if you get ftilted), outlives MK greatly (obviously excluding gimps. 5 ftilts + grenade = kill percents for MK). The only times Snake really suffers are when he's offstage, when he's on the edge, and when MK has him above him. Getting juggled can be avoided by smart use of B-reversal grenades, conservative air dodging, and fast falling back air (Ally does this consistently through rapid uairs). Utilt rips right through tornado.
Snake's sheer amount of damage and weight, as well as his projectile and techchasing, are definitely enough to put this matchup at even.
MK ***** Marth, it's not slight at all.
My "slight" is about a 55/45 or 60/40, if you went by regular numbers. I think the worst MK can beat Marth is 60/40. NEO, when he plays, beats the top MKs in his region. MikeHAZE always does very well against Mew2King and the other various MKs in his region. Tournament results indicate that this matchup isn't as awful as theorycraft would suggest. Once somebody decides to show that this match really is terrible, I'd be more inclined to believe it.
Doesn't MK have a small step grab release on Ness? Regardless I don't think it's very close, he just has gimmicks you need to be aware of...Lucas has a much better matchup unfamiliarity shock factor in his favor though.
If there is a grab release, it's a dash grab like on Lucas. Unfamiliarity shock isn't the advantage here. Again, if I had to put a number on this matchup, I'd say 60/40. Ness can stop dair camping, is floaty enough not to get wrecked by tornado (react to it being used as a landing trap and then drop a nair through it), kills MK at very nice percents via grab (and don't say he has no other kill options, uair and bair are awesome), and has the super awesome dash attack and fair.
Ness is also surprisingly heavy (just under Mario's weight) and doesn't have as much trouble recovering as you'd think. The PK Thunder (er...bullet?) travels very quickly, and MK has to be fast about hitting him before it connects. His second jump is also monstrous, and will often get him back to the stage on its own. Adding to the PK Thunder bit...due to MK's purely transcended priority, he can't outprioritize PK Thunder from the air. Ness can up throw MK and continue juggling him for a solid two or three hits due to the nature of the move. If he air dodges, Ness can redirect it right at him and hit him. This **** gets annoying. <_<
Need more Yoshi exp but I'm pretty sure it's not even, I think MK destroys Samus, maybe stage dependent but I don't think she's good enough against you on any neutral for it to matter.
Yoshi's GAY. Eggs are obnoxious and beat tornado (as well as any other move MK has due to transcendent-ness), so you're forced to powershield them (which can be difficult, their hitbox is quite deceiving). If one does hit your shield, it takes away a pretty solid chunk of it. Once you get closer, Yoshi's gonna start pivot grabbing everything. This removes tornado and dash attack as approaches. Oh yeah, you also can't poke his shield with tornado, which is annoying.
His spot dodge is at the level of Falco's, and he's much better at recovering than you'd think. Super armor on the second jump + air dodging/uair to avoid footstools = annoying. He's still gimpable, it's just not an auto-gimp like you'd expect. If you force Yoshi into his shield, it's a free hit, but don't count on it. He also lives like, forever, and has a guaranteed kill setup on you from a grab. There's also that annoying chaingrab crap which only tacks on like 10 damage or so, but it puts MK in a bad position (off the stage or on the edge). If Yoshi isn't running away and camping the whole game, though, he's going to lose.
I have more Samus experience than anybody else in the world. This matchup is not that bad. Also, if you're talking neutrals, Samus does EXCELLENT on FD. Samus beats MK at long and mid range, where she has projectiles and zair and he has absolutely nothing. MK obviously wins up close, that's not worth debating. She can avoid juggles with bombs (yes, bombs), and can be tricky to edgeguard due to her up B's big hitboxes and invincibility. She can also tether the edge as another recovery option.
Samus has some pretty cool 2-3 hit combos involving fast falled uairs and fairs into other moves (up B, jab, dsmash, dtilt, ftilt, etc.) that solidly rack up damage. Up B out of shield helps tremendously if her shield is being pressured. Dtilt will kill MK at around 135, fsmash and dsmash close to that as well. She also survives reasonably well due to being the 7th heaviest character in the game.
This matchup is really hard to explain on paper. Once you're actually playing it, you'll notice what I'm talking about.