@Dakpo: I prefaced my post by saying that G&W was bad (I didn't say terrible because I don't like to make judgements like that about people I don't know, but that's just personal preference and since you know him, that's your right). I highlighted that video to show what a player, who is intensely familiar with playing against G&W (metroid), can do using MK's tools. He can bait and out range and use MK's grab game, which is very, very good when combined with his fast and large dsmash range. It all combines into a ground game that is good at waiting for holes in defenses or lag on attacks and capitalizing on them. They both combo each other to hell and back so that's cool but for the neutral game, I (PERSONAL OPINION) think MK has the edge as long as he is aggressively defensive, using a play style like captain falcon DD camping.
I personally think G&W is a great character but very polarized. Pretty much the only reason I created an account here was out of indignation that G&W was widely considered the worst character in the game not too long ago. I think he straddles the line between high mid-tier and low high-tier fairly well and his weakness to swords or fox's upsmash (and to a lesser degree his reflector) are not insurmountable. But wouldn't establishing these issues as either issues or non-issues be the first step to devising counter strategies, as you suggest? We have to agree at least on the facts before we can extrapolate or "theorycraft" or play around them, right? Anyway, I believe these weaknesses are real and worth discussing in a thread like this. Sorry. Also, I don't have a gif.
P.S. I'm not nemiak in case you confused us. I don't think he weighed in on this issue so I wouldn't want to drag his name into the mud.
EDIT: About your points. 2. MK is very good at edge guarding. All he has to do is camp the ledge, jump stall and nair. Or wave dash to the ledge and jump stall and bair. As long as he knows the limits of your recovery range, he can cover it.
3. Bacon is not perfect and with a small hit box, he can avoid a lot of it fairly well. He can grab on shield or dash attack through it (MK's dash attack is pretty safe). He has dimensional cape and like I said, I believe his downsmash outranges all of our attacks if tipped properly and it comes out on like frame 5 or 6 or something.