Nair no longer sets up for followups if the latter portion hits, Glair deals less damage, and Up-B kills less reliably. Other than those three Charizard seems to have strictly buffs, hitbox readjustments to better match his animations, or remains the same.
You forgot that bthrow no longer kills now, which is a nerf that's complimented by the buff of the throw being very comboable, and that his dthrow has slower IASA now. Dthrow TCs are no longer as easy as they once were, although they're still pretty good on plats.
bubbaking, samus' up+b oos has the same flaws you are picking at g&w's up+b for. And also if you are really asking magus basic questions about how g&w's up+b oos works then you should be playing him yourself to figure it out before acting as an authority about the issue. <_< Theorycrafting only goes so far.
If you read my full post, you'd see that there's a lot more that goes into a char's OoS game than just his upB, but if we're going to be only talking about Samus' and G&W's upBs OoS, Samus' upB at least leads to tech chases on every stage that's not FD, and Samus' TCs are effective and
easy on plats. The same can't be said for G&W. Furthermore, the two chars can't even be reasonably compared because Samus is extremely heavy and also hard to combo and won't mind being punished for something as much as the super light and easily combo'd G&W would, PLUS she has a lot more good OoS options that G&W simply doesn't have.
WD OoS > any tilt or dsmash (or fsmash in some cases), nair OoS, bomb OoS, uair/fair OoS for specific scenarios, Samus has all of that. G&W has none of that, except for WD OoS dtilt, which is easily countered when you know it's one of the most probable things that G&W will do under pressure, and bair OoS in the specific case that the opponent attacked your shield unsafely behind you.
Also, why in the world do you think I'm theorycrafting? Just because you don't see videos of me around doesn't mean that I don't play this game. I ask questions because I don't trust myself to know the answers 100%, even though I play him a bit. If I tried to dthrow > fair Peach with Sheik but was a little slow without realizing it and got naired for it, do you think I should come on here and say, "Guys, Sheik can't combo Peach with dthrow"? No, I should come on here and say I couldn't do it, could someone confirm.
I just came back from a P:M fest with Vanguard, SOJ, and some others
5 minutes ago, and I'm standing by my original claim. G&W's OoS game is mediocre.
Edit: Seeing as how I play Samus at every Melee fest and tourney I ever enter, and you don't play Samus at all, as far as I know, it would seem like YOU are the one who's theorycrafting.
King DeDeDe 
Zelda 
