Seeing as MK I know more about MK's match-up then the other characters, I'll give him a shot first. Might come back and do some later tonight depending on how bored I am.
That fsmash right at the beginning of the match pretty much let Steel put you into a bad position. Right from the start, you're already looking at being forced off the stage.
Following that, there are a whole bunch of fsmashes and counters. Almost every time, Steel punishes and you lose a stock
You used SB too much during the wrong times. You try using it as an edgeguard. This puts you off the stage where you charge SB again to return. Steel easily jumps off and take another one of your stocks.
Now you start getting lucky. A missed Up B and a bad Tornado puts Steel down to one stock.
That doesn't help much, as you repeatedly mis-use or mis-space counter, fsmash, and SB. He punishes each time, and quickly takes off your third stock.
I can tell you have a nice grasp on the basics, and I'm pretty sure you'd do better against another character or match-up that you know. However, your bad usage of fsmash, SB, and counter are what kept you from getting more damage and stocks from Steel. Against MK, you have to be pacient, space well, and be careful of how MK attacks. I know this is wifi, but even over wifi, you can still do a little bit of this.
You abused SB both in the air and on the ground. Steel took advantage each time, making you that much closer to dieing.
Counter, although a very useful move, should only be used every once in a while. Steel recognized your over usage of counter, and baited it out. You were too obvious countering from the ledge. Try mixing things up a bit, as Marth really is terrible on the ledge.
Fsmash is ugly, slow, and causes chronic bleeding of the cornea. Do NOT over use this move. Replace it with ftilt or DB. You over used it, and wore it off for when it would have been a viable kill move. Especially against MK, you want to avoid using a move that has too much lag on it.
It looks as if you're trying to jump right on to the advanced moves such as SB, but you still have yet to get a grasp of the basics. Your spacing is off, and your move choice isn't quite what it should be.
I recommend looking over some of the stickies on simple tricks and hints for playing as Marth. I know it sounds way too simple, but it really helps. I hit a brick wall in terms of spacing and had pretty much the same problems you have right now. Looking over those threads, while at the same time comparing my gameplay to what it should be, really helped me improve.
I can't wait to play you online and at the Chicago smash club meetings. Good luck with your Marth
