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RedmanSSBM
It was definitely a good read, but that's why we have so much writing on theory and everything. There are a lot of ways to play every character, but an aggro Marth is probably rarer than a defensive Falco is. Assuming you properly play the neutral, you've got to remember that you're going up against your own capabilities. Winning the neutral in this MU is going to be even more difficult than in any other MU for Marth just due to how inherently skilled he is as a function within the game. It's definitely a weird MU, but if you're confident and skilled enough, then I have no doubt at all that it's extremely fun. My honest suggestion would be to treat him like any other Marth main. You don't know how good he is, how he plays, or what kind of reads he'll go for, so you give him maximum respect and only go for the safest of options. I've heard that @
Dr Peepee
apparently has a list of rules for the Marth ditto in which the phrase "dtilt is very good" (if not exactly in those words) is strongly emphasized, so remember all of your tools. A fellow Marth main at tournament two weeks ago told me "Marth is probably the strongest character overall in the game, but if you take out any part of how he works, he falls apart completely." Take that to heart, even as I'm trying to do much the same.
Sorry for the massive wall of text, but I needed to flesh that out.