Falco is still really good in pm. He is the worst of the 3 spacies, but he is a lot better than the other characters in high tier
I don't know where to put marth either. I want to say hes high tier but I also want to say hes upper mid.
Roy is godlike. Seriously. He's amazing. I could just gasm all over roy for hours jfkl;jdsklaj;dkj;alkd;kja;l
Lucario is also really good in 3.5, the argument that he has an awful neutral game isn't really good/relevant, its fine lol. His punish game/shield pressure is so insane, the street fighter character in a smash game mechanic makes him ridiculous.
I disagree about Lucario. His punish game is very good but all the potential doesn't mean a hit leads into a KO on top level, at least you can force him to need reads if DIing correctly. The neutral game is key and Lucario's bad horizontal air movement is hurting him.
Mainly, those are reasons why he isn't top tier:
People overrate the importance of Lucario's shield pressure way too much. If you are able to get a comfortable hit on an opponents' shield with Lucario, they probably did something wrong. You have to shield some moves, but not the ones setting up for the shield pressure. The dash attack itself is risky in neutral, and most good Lucario's aim for auraspheres in neutral which I am convinced is a good strategy. The real threat of this strategy (which most players don't realize) is the compromising that happens. If you have some set of acceptable non-transcendental-priority moves, you always have ways to use one of multiple defensive options that barely give you a frame disadvantage, combined with the movement. The problem just starts if players see the auraspheres as the main threat and then get caught offguard by dash attack/grab/run-cancel something...
The aurasperes are barely puished, too. The common way seems to be to mix in some kind of approach after dealing with one aurasphere, but Lucario can easily react to it if he played with the mindset to use the auraspheres as bait and mistake provokers in the first place. There are multiple interesting alternatives: If you are a fast character/quick punisher, you can gradually get closer to Lucario and approach a zone where you can still deal with the auraspheres unpunished but throwing out auraspheres becomes unsafe. If you are at low %s you could try running in "anti-cyclic" (so when the aurasphere is about to get thrown out), crouchcancel and follow up. Other characters have better projectiles than the aurasphere. Lucario's neutral still works on some characters but way too many characters have clear ways to fight it to warrant a top tier placement.
I'd place Lucario in upper mid tier, could maybe accept high tier, but not top tier.
I don't want to put out no reasoning, but also no wall of text for every disagreement, so it would be kind to reply and say which of my disagreements you have questions about or which you cannot understand.
Samus is roughly even. The Melee->PM changes are definitely changing lots of stuff.
Also Peach is probably slighly/moderately losing (like in Melee).
ZSS is roughly even imo.
Squirtle loses either slightly or moderately.
Lucario loses slightly.
Pikachu could beat Marth slightly but I understand if that is still in the roughly even range, depending on where you want to put the borders.
Way I see it, Fox shouldn't have lasers at all. Why give a character a tool that makes it so they dont have to approach at all on top of everything else he already has?
Shine's a whole other problem too
It is probably for design, character identity and Melee reasons, and not for balance reasons.