Wow, I must say that you're actually very good in tech skill. I've never seen anyone powershield a falco's SHL consistently (I think it was 4 times in that match), so kudos to you.
BUT, as Imperial Marth said, you're lacking in mindgames, but that is something thats going to take a while to develop, since you can't just learn it in training mode.
You MUST learn how to punish fastfallers in chaingrabbing. In you're first match, you seemed really nervous and would always mess up after the first or second up-throw. Marth has the ability to make a fastfaller's only mistake into a death by just simply having control of them while chaingrabbing. USE THAT ADVANTAGE!
Theres a couple threads somewhere in this forum that focuses on chaingrabbing. If I find them I'll add them to this post. But the way I practice chaingrabbing is just playing fox/falco (always swap the 2 after a while to get used to the slight differences) at lvl 1 until i get used to what should be done at what %, what % it takes until they can DI out of it, the works. Once you get the hang of it, switch the cpu lvl to 4 because it's DI is always random.
Hope that helped