Blue, i watched some of your videos on youtube. Your marth is pretty good, but u should be using your up and downsmashes alot more theyre marths best moves and instead of doing those air slashes just do forward smashes, if you practice these things i think youll be pretty good. I can upload a video of me playing if you want that will help you improve.
yeah....no.
I didn't watch his vids either, yet, but regardless of how blue plays, your post, combo, was just....wrong.
Downsmashes are situational. I can think of a couple of reasons why I would use it but the number one reason why I use it once in a while is to tech chase an opponent to cover both the opponent teching in front of me and behind me. I use this at times when, for whatever reason, I have absoultely no idea where he is going to tech. I suppose once in a while I do use dsmash to hit underneath an opponents shield if I think it's going to connect.
Upsmashes are situational...at best. I can think of a couple of reasons why upsmash might be used but even then, I find something better.
Anyways, marth's best move is not the foward smash, IMO, marth's best moves are his grabs or the move you call "air slashes" (I assume you mean fairs) Fairs combo very well into all sorts of things, and has relatively little lag time compared to his forward smash. You start spamming forward smash and you'll find yourself getting punished via wavedash out of shield.
eh, that's the gist of it.
Blue, I'll watch your vids later.