Marth just feels so much more rewarding, honestly. The DB buff alone is enough to compensate for all of the nerfs he has received since Brawl, but the f-throw and d-throw nerfs also helps in the sense that you can f-throw to f-air a bit more than usual.
Marth feels more natural because he's more rewarding. You still have to play relatively defensive and not go on the aggressive, but I find it to fit his character well. Even ignoring the fact that Marth actually loathes fighting and actually only resorts to violence when necessary, he still has graceful combos via his aerials and DB, but he still has to be careful and think wisely before moving. You have to use your movement options to bait openings, perfect pivot, SH AD, or even just single jumping to approach and double jumping back away so you can get something off of your opponent, if you see the opponent start to attack, make sure to provide space by using f-air, and you're all good.
You had to do these before, but now you have a much better neutral with Dancing Blade and the slight buff to combos just makes everything so much more rewarding and fun. I feel like I'm playing the Hero King Marth, not a Marth that is on support and needs crutches.