i think u move too much regarding the 1st video, as yoshi's story is a small ''map'' u shouldnt move that fast, cause it costs one stock to u, i think it sthe second.
second fight was better, but since marth is not a rly good player, u can combo him alot. but i think that eventhough u are winning all the time, he is better than you.
the3rd one was the worst ever, 1st of all, marth was nearly to die bcz he pressed L nearly the edge, but he was kinda lucky bcz he edgegrabbed. Then lol @ falcon punch in 1.40, cmon dude if i were marth, u would be dead already. Marth doesnt rly know how to grab, i mean, marth is ****ing bugged at grabbing, but he doesnt use it alot, he grabs u, throws u up and then he lets u fell, he should grab u again and so on... when u suicide urself at 1.47, u ****ed up the amtch, u were at 0% and he was like 70%, why do u do that ****?
if i had to say and overall view, u should use A LOT more DOWN C-STICK, bcz u barely use it and its rly usefull