okalee dokalee.
Before I start, I'll say that my critique comes from the school of aggression; because you use White Marth I'll be forcing my biased style upon you. Also my mind has been reasonably boggled recently, so if something isn't coming out clearly just ask for clarification.
FIRST
0:08 - A nice fair on the shield, and the obvious reaction is a spot dodge. Instead of retreating you could have gone for a dtilt/dancing blade: hitting them off the edge and scoring you upwards of 20-40% extra damage from fairs/nairs and uairs. Zip.
0:14 - You do a full hop fair here which against ROB isn't fruitful. He's large so if he did jump you could have hit him at the short hop height and if you miss you're not suspectable to ROB's great 'upwards' punishment. A short hop fair to dtiltesque pressure would have been more suitable.
0:28 - With the gyro there you decided to roll. Come ON. You were better off temporarily camping.
0:58 - You went too close into ROB while trying to fair, retreat!
1:26 - Did your controller lag or something? He made it really easy to pursuit with aerials... But you stood still spamming upsmash???
1:35-1:45 - Yes! YES! Brilliant.
1:58 - There are other examples even in this match, but you are dangerously crossing it up a bit too often; and took some damage because of it.
2:35 - Roll predicting with mirroring the dancing blades, goody!
3:25 - Last time I critiqued you with the Snake matches this is something I pointed out as well. When you're "stuck" in a corner on an edge, you (and so do a lot of others) roll forward to get behind your opponent and get predicted/punished.
3:55 - He's charging up fsmashes and you feel helpless? BANG shieldbreaker. Try it.
4:07 - :\, you try to edgeguard/own ROB while you're in danger quite too much, you should have just ds'd to safety then attempted to hit with a dair like youve done everytime. Oh, about that, try nair.
4:35 - A Marth rolling doesn't know what they're doing ;_;.
4:40 - While you've been truly showing superiority via aerial shield pressure, under that platform you're at the disadvantage. You can definitely afford to pick up the ground aggression a bit.
ENDING - You almost lost this match and it should be obvious why. As the previous point suggests there are some gaps in your ground game, which is required for mixing up against characters who actually outrange your fair from the ground...
SECOND:
0:25 - Just like the previous match, when you're pushed into a corner with the edge behind you, you make some really silly mistakes by either jumping straight into their upwards fsmash/**** or rolling into their downsmash/****. Your options include good ol SHIELD THEIR **** to dolphin slash or if they're not that close a poke (dtilt/sb) or a feint (i.e. jump retreat ff shield ds), or perhaps just jump straight back onto the edge. It's a small part of your game you can improve nearly instantly.
There's not much else I could personally critique this match that hasn't already been said. Your aerial pressure is tops, but most of your damage and punishment comes from not being able to uphold the pressure while grounded. SH Retreating Fair is godly, and you're tipping it most of the time, but there is more to the game.
Plus the ROB kinda walked into your **** continually... eh...
THIRD:
1:40 - I know you love fsmash, but you don't use downsmash AT ALL. AND RIGHT HERE RIGHT NOW was a great and GUARANTEED death using one. Hell even an utilt/upsmash would have done fine. You need to bring downsmash into your game. IT IS A GOOD KILL MOVE.
3:05 - move selection. I'm pretty sure you did a fair. An Up Smash, or uair could have done nicely. Actually a tippered upsmash would have practically killed him lulz.
3:53 - Backed into corner syndrome example.
5:22 - You didn't follow that drill rush properly.
5:27 - OMG YOU DID A DOWNSMASH? Well well... yeah it would have killed if it tipped, so wow, good work Ankoku.
FOURTH:
0:07 - Quantum of Solace sucked right? Anyway from the wise words of Pierce! A quick shield drop to shield results in a perfect shield that can then have you do a sexy DOWNSMASH after it. Safer than DS, not as easy I suppose. But you wouldn't have been punished for punishing if you had done the 'right thing'.
Not much else to say here, I guess you walked into some SILLY **** at around the 4 minute mark; don't tell me why, but I presume you were doing hard drugs at the time (p.s. JAB would have done better than fsmash again him spamming up b).
FIFTH:
0:55 - You should have uair'd here. With the platform there for continuation, you could have nicely done two uairs or an uair to fair. More damage the better.
1:00 - Backed into corner syndrome, except really really unlucky.
Conclusion:
Over all your Marth reminds me a bit of mine at certain points, definitely helps that I also use White Marth. Your pressure with aerials is superb, but you need to brush up on ground pressure. I felt your opponents weren't really doing things as effectively as they should, the MK didn't use ftilts or nair at all; two moves that can really devestate, especially against Marth's aerial pressure, it can effectively shut it down completely.
You're bringing in some downsmash which is good, you nitpickingly used jab from time to time in the right situations (but of course there were more than just the ones you used them at), your fsmash spamming is getting pretty good, it's inspired me to start bringing fsmash back into my arsenal (
). Anyway ground game.. uhh, the dtilts, shieldbreaker if they're that far away... jabs... upsmashan. I'm sure you'll figure something out. Up Air was seen but not 'heard', there are ample amounts of situations where uair could have been great.
Other than that only the backed into a corner sydnrome was a problem, and I fully know how hard it is to avoid the **** here, but you can play a lot smarter. Corner Syndrome results in a death if you're vsing a Snake, as I'm sure you're aware. Avoid the ****, don't get hit, use Luigi's tornado to approach as it's the best one ever, etc.