You wanted advice? Here we go. I'm gonna unleash it on you.
I'll start off by saying you did good in the first match. Now for the critique. I'm going to give specific instances of where you could of did soemthing better. And overall play advice as well.
Here we go.
Video 1
00:05 - Missed a chance for an easy grab. You threw out a d-tilt aand could of went from there, but didn't.
00:08 - Went for a fair. I guess you reacted late to Samus being above you. Anyway you should have just attacked sooner or did an u-tilt. Another little trick is to waveland onto a platoform and grab. People really don't expect it.
00:15 - Did a full hop fair and ate Samus's boot because of it. If you want to feint at an opponent you have to make sure they can't punish you or if they try to punish they set themself up for punishment themselves. Watch your spacing.
00:21 - You knocked her away and didn't chase. Why?
00:26 - That wavedash back was unnecessary. You could have just let an f-smash rip, or a reverse dolphin slash. Reognize when you need to space yourself and when you can just attack. Your choice cost you an easy kill.
00:30 - Samus did a bomb jump to avoid your attack. You should have expected that. You should have been DIing backwards as soon as you saw her bomb jump. Then jumped back after the fair was over witha bair. I'm fairly certain you would have hit her and set-up for an easy edge guard. Learn to recognize when your opponent can escape your attempts to attack them and then use it to your advantage.
00:48 - You really like getting hit with those plasma shots. Just something I noticed.
00:52 - Should have went out and attacked Samus.
From 01:00 to 02:00 - There were alot of times where you just didn't edge guard Samus at all. Edge guard Samus plz.
02:18 - Samus was invincible and you stood there and let her grab you pretty much.
02:24 - That was a bad time to forward b. Just like I said earlier about waiting for people to try to attempt to get away from your attacks. Phanna did it to you here. Punished your use of forward b to avoid getting hit and you got hit anyway. See? It works.
02:28 - In close proximity it's generally better to nair through missles or shield then WD from shield, roll, or JC aerial from shield.
02:36 - Where was the shield?
03:38 - Should have followed up with a full hop fair after your forward throw.
05:25 - Ok, to be honest this charge shot shouldn't have hit you. The sound is completely different from a missile. And you had plenty of time to be able to tell the difference.
05:30 - Stood there with your shield up and got grabbed. You should be avoiding Samus' grab on reaction.
Overall your play was solid. There are just somethings you need to improve upon. For one thing you never went out to hit Samus when she was off the stage. There really isn't much she can do to stop you. You can slice right thourgh bombs or missiles. Just run off and fair, Shield break, or reverse dolphin slash. There is no drawback to attempting this once you get good at it. Worse case scenario is that you miss. So what? Try again. Best case scenario is that you get a kill. Always edge guard Samus. Always. You were also very fond of full jump fairs. I know what this strat is all about. Zoning and space control. But you may want to mix-up with double jumped FF fairs.
It's a little less vulnerable and it's a little more aggressive. also you will fall faster after a double jump. Whenever Samus was on the ledge you would always do a long wavedash back. Why? You have nothing to fear. Space yourself so her ledge attack won't reach you and then you can retaliate. There is no reason for you to back off like that. If you space yourself correctly, there is very little she can do to avoid getting knocked back off the stage when she tries to get back on. Another thing you may want to try is perfectly spaced SH Fairs. If Samus takes the first hit she will most likely attempt to CC in which case you can come down with a Dair. If she shields she may attempt to JC aerial, but with good spacing you'll be safe. Also you threw quite a few d-smashes. Phanna was slow in trying to punish you when he shieled, but everytime you did one of those, I had a thought. That though being, " Dark Sonic just died. Which would have happened if Phanna had been on the ball with punishing you. Don't rely on that d-smash so much.
Video 2
00:00 to 00:20 - Seeing ALOT of blind aggression here. Learn to focus that fury.
00:06 - You really should have expected a CC here. It was obvious that you were going to FF an aerial. You should have did a Dair so she couldn't CC. Either that or FF and grab.
00:17 - You died foolishly thanks to being overly aggressive and not thinking. Be aggressive if you want. Just be smart about it.
00:25 - As soon as that missle touched your shield you should have buffered a roll or JCed from your shield.
01:20 - That was a free grab.
02:55 - You didn't need to wave dash back like that. Lucky for you Phanna killed himself. You tend to do that alot. Break that habit. You mess up edgeguarding opporunities by doing that. Especially since you slid off and grabbed the ledge.
You really screwed up in this match. You were reckless and made many mistakes. Pretty much everything I said about your first vid should be applied here. Also you need to plpay alot smarter in general. For the most part in this match you just made bad decisions and were very predictable in your approaches and your methods of retaliation.
You seemed to like those shuffled nairs, but did them at bad times. You used full hop fairs far too much. I didn't see any JC grabs or d-tilts. Just fairs for the most part. That's not good. You can't win or get better if you don't use the tools available to you. The main thing that you should take from this match is that you need to laern to play smarter and safer. Don't do something if it will put you in danger or a disadvantageous position.
Video 3
Why did you even counterpick this vs Samus? Why would you counter pick this at all? Marth sucks on this stage and Samus does pretty well. Anyway, I can't really critique this because it was mostly just fin abuse on both sides. When you guys actually did fight I saw some mistakes on your part here and there. One time you got a tippered fair and could have grabbed, but you chose to nair instead. Once you did a d-throw and chose to f-smash, but you could have f-tilted or chased with an aerial. Little things like that. Watch the vid some more to catch those mistakes and think about how you can correct them.
In all honesty no Marth shouldn't be counter picking this stage vs Samus. And if you are gonna counter pick this stage then you need to make sure you are d*mn good at abusing the fin and that know how to stop fin abusers as well. Generally if your opponent grabs the fin. You wait for there ledge dropped aerial. Then let them up b and hit them out of the up b.
Well, that's pretty much it from me.
Hope I helped.