Good point about aggro Roy taking people out of their comfort zones, I wonder if that's the best way to play him. The thing is that Sethlon is obviously a really great player who probably could have gone far with any character if he put the time in - maybe even further with Marth? I do appreciate the anecdotes, Shokio, but I'm one of those guys who cares a lot about frames, match ups, and theories, all of which make Roy look kind of shaky to me right now. Maybe he just needs more time.
Yeah, trust me, aggro is definitely the way to play him. The way I see it, aggro is the only way to play Roy, you can't afford to be on the defensive. And that's not to say that you can't play him Hot-Cold, but you never want to catch yourself just standing there shielding or else you'll get grabbed, thrown into the air, and knocked off-stage, and we know what happens when Roy is off-stage
But yeah, with Roy, it's all about scaring people and putting them into a defensive play style, which you can then proceed to dismantle them with grabs and Dtilt -> Fair combos. Getting them on the defensive and having them shield a lot will guarantee you the match, unless it's a projectile heavy character like Link who can use his attacks for a defensive style of play.
I dunno about the whole Sethlon and Marth thing. In my (non-pro) opinion, I don't think Roy is
too far from Marth at all. Maybe he would've gotten farther, but only because Marth's metagame has been years in the making while we're dealing with a whole new Roy here. The only advantages are that Marth can recover better due to his better fall speed (which, sure, is a huge advantage) and he has a spike that is much easier to hit. But Marth has trouble killing at high percents where Roy does not. Roy's early kill potential is amazing, as well as his kill options. All Marth has is FSmash really. We saw this with Gravy vs. KDJ, where all Gravy had to do is avoid an FSmash and he was able to beat Marth. If that was Roy, he would've been dead a long time ago:
FSmash, Flare Blade, Bair, DSmash, FSmash, Counter, Dair, and even FTilt are all kill options. That's 8 kill options, with only 2 being situational really. To answer your initial question of whether or not he has better match-ups then Marth, I'd say yes, and that's to any of the light-weight, floaty characters. Kirby, Squirtle, Jigglypuff, G&W, and the like, get eaten ALIVE by Roy. He can kill them so quickly it's not even funny. (There's this G&W main at my scene who I can take all 4 stocks from without him ever reaching 80%.) ESPECIALLY when you take them to small stages, such as Yoshi's Story or Wario Ware. One DTrhow to FSmash can kill kirby, Jiggs, and I think G&W at 0% near the edge of the stage. DSmash and Dair especially are effective against these lighter floaty characters. Need to kill Jiggs or Peach? Crouch-cancel into DSmash, they're dead. Best way to kill floaties off the top of the stage.
And then there's of course his reverse Blazer that can kill Jiggly and Kirby at any percentage off the top as well. Go to Yoshi's, hop on any platform. 0%, reverse Blazer, they're dead, instantly, no questions asked. You might say that's situational, which it is, but I've actually managed to combo light-weights in the air into a reverse Blazer, so it's something you can actually lead into as well.
Even for the likes of Fox, Falcon, and Falco, I'd say Roy is the better match-up. Take Falco to Battlefield, go to the left of right platform, have him at like 33%-40%: UTilt -> FSmash, he's dead. Roy's pretty great against fast fallers as well since they fly more horizontally and Roy's FSmash has so much knockback to it. If you land a FSmash on them while they're in the air and around mid-percentage, they're goners. And when you need to edge guard Fox's better recovery, just counter just like in Melee of course. Roy's counter has a mean multiplier on it, if someone gets hit by that on the edge of a stage they're pretty much dead. (If you counter any of Ganon's moves, he's a freakin goner lol.)
But if you're the frames and theory kind of guy then yeah I can see where you're coming from. Roy doesn't have much going for him frame-wise.
I know I just talked him up a lot but of course we all know his weaknesses: His weight is weird. He's a fast-faller which allows him to get juggled easier, but at the same time he's
kinda light, giving him no resistance to horizontal knockback. He has some survivability from getting star KO'd but that's about it. Then of course he can't recover due to how ridiculously fast he falls and lack of range from his Blazer. But see, that's why I say aggro Roy is the only way to go. If you're staying on top of them, they won't get the chance to juggle you or knock you off-stage while in the air. They're 2 big factors, yes, but they're only 2 so you don't have much you need to manage, you see what I mean? If you stay on top of them, Roy is definitely vaible.