I don't know if we could count Robin or metaknight or even pit/dark pit as swordsmen.
If they use a sword for the majority of their moves (tilts or smashes for the characters in question) I would say yes.
My list:
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Cloud is head and shoulders the best sword, none of the other swords are even close in results, and he's the only character in the game that can be considered for a ban in doubles. Clear domination.
Marth/Lucina/Corrin are pretty neck in neck. Corrin is doing really well though, maybe him and Marth will switch spots on the tier list one day. I have doubts about Corrin but he's been proving himself.
MK still does MK thing and surprises us when we forget about him, including MKleo mangling Zero with him which was a testament to say that MK is still truly deadly against certain characters, like Diddy.
Toon Link no longer has real rep without Hyuga, but I can't see anyone else lower than him better. But he's certainly not going any higher.
Ike was struggling for a long time, then the Ike mains had go showings again. Still mid tier, but by no means a bad one.
Link is still scary with how surprisingly hard he hits and keepaway but doesn't flow as well as TL. T makes him look godly. Another really good mid tier.
I'm tired of the Pits being placed so high when they don't do anything asides Earth, and even then, not placing the best. Very middle ground but a great neutral. But middle ground doesn't count it in a gsme full of jank. Middle of mid tier. Too solid for low.
I don't know anything about Shulk sides from "bad frames lol" but I think Shuton used him to success last event so that's nice. He is underexplored but that's due to technical gap. Why strain yourself in top level play to get a character not as good as Cloud, even at elder Kai unlocked potential level? Lower mid tier.
Roy is a lot better than what the tier list says, but the others listed are better. Don't know much either here. Lower mid.
Robin...ugh my favorite sword and not too good. I can say a lot about you but I'm lazy so yeah. It's not running out of tombs that is the big issue or damage output, killing, etc. Run speed. Run speed neuters Robin so badly. It makes it harder to camp when you lose tombs(10 second average or whatever it is for tomb recovery isn't easy when you're slower than Jiggs on the ground.) Then you have the issue of losing Elwind, considering it's an amazing damage racker and move out of D throw that can also kill early with rage. It's so useful that you may overuse it. Once you do, you are not going to last 40 seconds for another one without being thrown off stage. Your recovery becomes worse than Little Mac tier. So you can't even use it's actually really good spiking ability without fear of losing it offstage
You lose elwind, you lose the stock.
Then you have the run speed, which makes you lose so many follow-ups out of arc thunder or Elfire. Elfire isn't so bad as it is a mostly close-up move. You can get your follow-up or cover ledges with it relatively fine. But arcthunder? Unless you're in point blank range or at least a character body away, you are not getting another follow-up opportunity. He's just to slow to link the leven sword into it for kills and damage.
Tournament results aren't helping either considering 8 Robin mains didn't even make top 48 at FE saga, including Dath. We need that cosplaying Robin who beat Nairo once to rep the Robin meta lol jk.
Leven sword is really incredible though and only a 6 second wait for a new one is nothing. Imagine level sword on...anyone faster. Also d throw kill confirm is still good. Not great like other ones but very solid.
I love you Robin but bottom of the mid tier. Maybe top of the low if you continue to fail so badly.
Oh and lol 1111 Mii Swordsman. Unfathomably bad.