I'm more referring to winning in the amortized sense, in other words, who's more skilled isn't determined by playing one person, but instead, who can beat more people.
The situation I'm really referring to is "the proof is in the eating", if the person is able to beat just about everyone, then it's pretty fair to say that person is quite skilled, correct? On the other hand, a person who can only beat, say Mario and Luigi players because Metaknight has an extremely good match-up against them.
The scrub metaknight will then be murdered by anyone with an even match-up, or just a slightly bad match-up. Heck, the more experienced players can probably counter-pick an even character and it's game over.
However, mid-game, I'll stick with
Sirlin's list, those are the attributes which produce the result of winning, yeah they do (sort of) boil down to making good decisions, but the reasons WHY you make the good decisions.
Not really, I can easily beat a number of people who have a great deal more technical skill then me. Technical ability is one aspect, adaptability is another, Yomi (aka, mindgames, my preferred aspect of gaming in general) is another.
Making good decisions is a reasonable way to summarize it, but again, the "why" is important.
But again, this should translate to winning matches, nobody would remember Ken if he didn't win matches after all.
This is irrelevant because it randomizes the situation far too much, the trade-off is far too great.
However, for completeness, metanight, ROB, Marth, Falco, Wolf, and Toon Link all have good final smashes.
As compared to Snake and G&W who have pretty bad ones.
And who that is low tier has a good one?
Sonic, Ganondorf and (I believe) Captain Falcon.
I'm sorry, but it increases the gap, not decreases it, plus, the high tiers are generally able to get it better.