!2RAW! pretty nice marth, but i agree with "The Newb" has to say, except that i dont agree that u arent that technical.
one thing u really need to work on is mindgames, ur play style is just very offensive, and u throw out a onslought so your always in the oppenents face that will leave you open for a lot of attacks as shown in the 2nd battle. some times u just gotta stay back and play smart and go in for a quick few slashes and get into a combo and back away and try to read your oppenent. and when u Dash Dance try to do little bit longer strides so you just dont seem like your in one place, u just dash dance a little too fast to even make it look like a mindgame, so when u got for longer strides it will appear that your going to him but dash dance back and go to him again and u go lead up into a N-air and try to pass him so if he blocks it u can just l-cancle it when u land behind him and dash back into him from behind and grab him.
you definitely got some skills but just learn to play smarter