@OniTheWolf
Ok so far I've only watched the first one. Here's some mistakes you made or things you should improve on:
Ok most of the time whenever you approached MK, you always seemed to try to attack him. The problem with this, is that it lets the MK predict you. You can't always run STRAIGHT to MK. I saw a couple times later where you mixed it up, which was good. Try to remember to mix it up more though
. Also, whenever you approached MK, you didn't space very well. A lot of the times you jumped right into him ( and in these situations he hit you with either a fair or nair usually ).
Also, you used a bit too much fsmash. Some points in the match were very bad to use a fsmash and could have and shuold have been replaced with a dtilt or even a ftilt. Fsmash has too much lag, and especially when fighting MK, he can dash right at you and punish you really hard.
Dair. You FF'd all of them, resulting in a ton of landing lag. This is very bad. The only times you should use Dair ( excluding very sitautional situations ), is if you do a full hop out of a shield and Dair, and DI away from the opponent, to get away from them if they were shield pressuring you. The other time you should use Dair is with spiking, which is obvious. Later in the match, you tried to Dair MK while he was Up Bing. Don't do that. Fair would be better, or ftilt or dtilt, or even fsmash. I mean, you can't just short hop off and expect them to Up B right into your Dair. They could have waited for you to Dair, then Up B to punish you.
At the end of the video, when MK was gliding toward the stage with his Up B (which was a very bad mistake for him, since he should have flew under the stage), this was a good time to use fsmash, instead of fair or the other attacks you used. Although he could have dodged a fsmash by flying higher, he wouldn't be able to reach any of the platforms, and he would not have enough momentum to keep on flying higher. So, he will eventually fall to the floor, with lag, and then you can finish him off if he dodged your first fsmash.
A few times MK was shield pressuring you. A Dolphin Slash OOS would have been a good idea
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A few times throughout the video you ran at MK and tried to grab him, like 4 times. If you miss the first one, then you should abandon the idea of grabbing him again. A good player would easily learn from then on that his opponent is trying to grab him, and he will adapt and jump into the air whenever you ran towards him, or hit you if you ran towards him.
Marth is not very good at all for close combat ( and I'm talking about really close, not just melee ). Instead of trying to grab MK when he was close by, you should instead try to get out of there. An example is to full hop away, with a fair ready to go if he pursues.
When you use Dancing Blade, in almost every situation, if you miss the first two hits, then you should immediately stop, not go on.
At 2:50, when MK landed on the platform: don't be afraid. You stood there. However, a better idea would probably have been to short hop and uair, or nair, or such. Reason is, that there is a platform blocking him from glide attacking you. There was no way he could have attacked you from there, and you wasted a bit of your shield unfortunately.
at about 2:42 : You sort of wasted your double jump there, right before you FF'd and did a Nair. One jump would have been enough. If he Up B'd you or knocked you off, then you would only have your Up B to recover with, and knowing that MK is extremely good at edgegaurding and that his Up B has great knockback, you most likely would not be able to make it back.
Ok well yeah, these are most of the mistakes/things you should improve on, that I can think of for now. If you were expecting any comments on anything you did right, you should know that for yourself
. And it's a critique anyway XD. But if you really don't know what is right or ok to do, then basically anything besieds the above I mentioned were fine.