The shuttle loop is tough to react to, but not impossible. Once you learn the matchup, you can predict that move very often. I don't think the shuttle loop needs to be nerfed at all with kb because DI is the kb nerf and reaction practice takes care of that. The part about the shuttle loop that I find borderline broken is how versatile that move is. It can be applied in a lot of situations. I would propose a nerf to gliding as a whole but I have no concrete reasons as why so I'll leave it for now.
This. Shuttle Loop can be used in so many situations it's not funny (it really isn't funny guys). I don't know how it could be fixed though so it can't be used as much as it is. Almost all of MK's moves lend themselves to ending with it and it does considerable damage (not sure how much but I know it's a decent amount). I was thinking of having it slowed down before he flips over so the person has a chance to escape the part before he flips, because it IS really fast but this would also probably nerf it as a recovery as well (but his recovery is too good anyway so it needs a decent nerf anyhow). But, I'm not so sure if that's the way to go about it.
I definitely don't like how MK can kill earlier than Sheik and they're pretty comparable to one another. Sheik is like the only character in this game that was purposely built for gimping, it would be so cool to have two gimping characters just like there are two great aerial mobility characters (Jigglypuff and Wario). If MK was made to be a gimping character, a lot of his moves would need to be changed entirely but, you can't deny it would suit him and possibly nerf him at the same time. Look at Sheik, she dies well at the same percents as MK does now (100% roughly from most characters) and she has a comparable style to MK except she doesn't have a powerful Up B that can end combos and she doesn't have a ridiculous recovery. I think the two are quite similar and IMO, this would balance MK and not make him and Kirby so similar.
But, I don't think many people want this so whatever. It's been proposed before, I think it would be nice, all we'd have to do is lower the KB and damage on all his aerials, lower KB on Dsmash, lower KB on Shuttle Loop (or keep the same, whatever), nerf his gliding, and buff something I guess. However, I wouldn't look at changing him to a gimping style character as a nerf, as it REALLY IS what he already excels at, it's just he's... ridiculous with it.
What does everyone else think? Ulevo?
One more thing, on the subject of Shuttle Loop. It's the
only Up B in the game that combos so effectively and KOs so well (if you discard all DI). No one else's Up B in the game combos as well (Falcon's isn't that good, don't even mention his, you know HIS is at least avoidable). The problem I have with MK's is that you
can't avoid it well at all, some times even with DI, it can't be avoided because it just lends itself to loads of situations.