The way I see it, sometimes it is and sometimes it isn’t. There ARE situations where, for example, you should hold off on a board clear for one additional turn in order to kill more minions with it, especially if you can use that mana towards something else like card draw. In that case your skill is lining up your removal on an extra minion.
However, in order to even do that you need to draw the card first, and the best way to answer all the threats is to draw multiple correct answers and not even need to hold back. So there’s a huge luck element as well.
As I already said I think luck is the bigger factor here. Skill is a factor, and most importantly a factor under some degree of individual control, but it’s not the biggest factor.
One thing I forgot to address here is deck popularity. Now of course you could imagine a meta that’s 99% scissors to your rock and blame the fact that you don’t have a 99% winrate on deck popularity. You can’t really untangle the meta as a whole from performance.
One thing my analysis covers is the effect of the difference between the D4-1 meta and the top Legend meta on winrate. Unlike trying to untangle the entire meta, this is just looking at one measurable meta shift.
The effect of that particular meta difference is approximately equal to the effect on winrate of the skill difference between those ranks, in this report anyway. The highest effect of the meta shift is +2.78% and the lowest is -2.39%. Top Legend might be different from D4-1 in terms of what opponents you’re facing, but the effect of this on winrate really isn’t that huge.
It’s also worth noting that the meta effects on winrate at top Legend, although small, are usually rational. By which I mean: the deck that gets the largest winrate bump from the meta shift is Undead Priest, which goes from Tier 4 to Tier 4 as a result. With 0.11% popularity at T1KL, it’s just not worth metagaming against. The one that got the biggest decrease in winrate due to the deck popularity shift was Pure Paladin, because of course they’d metagame against the most popular deck.
So it really should just be “most of this game is straight luck of the draw.” Which is true. Deck popularity isn’t really a big factor. And deckbuilding skill REALLY isn’t a factor, because netdecking.