@diophan Comment wasn't directed at you, Ryan. It's become a familiar refrain in these types of analyses, so I thought I'd beat others to the punch.
Also, I wouldn't say winrate is nearly useless. I would say that winrate (for a single event) is completely useless. The sample size is not large enough to make up for deck heterogeneity, player skill, and the variance inherent to Magic.
@ChubbyRain Its not even just that its from a single event. Its that a focus on win % ignores the metagame % entirely. The 3 most popular decks at this event were also the 3 worst according to win % (not counting other).
thanks for your time and hard work. it is nice to see what decks people played. I was wondering how many people were on storm or doomsday. it seems that more than I though.
Win percentage against the field aside, Gush was disproportionately represented in the top 8 anyway if you consider that it was (only?) 32.7% of the field while making up 50% of the top8. When people were gunning for it that is.
I mean the takeaway from the win% + metagame representation seems pretty clear to me. If you're not going to pilot a gush deck significantly better than the average player you should play a different archetype. How is that a useless takeaway? I really disagree with the sentiment that people can draw the wrong conclusions (or conclusions one disagrees with) from derived information so we should disparage that derived information. The sample for each of these tournaments is small, but look at all the online and paper results from the last 3 to 6 months and the story for gush is amazingly constant.
@diophan If we are just trying to describe what occurred during the tournament the win% is fine. When making a decision like what to play based on empirical data, you'd want the sample size to be sufficient. Decision rules based on numbers always require a high sample size to reduce your type I and type II error rates.
In June and March, Gush's win% was well above 50% and in all of the other months its been hovering around 50%, except August. I'd gather that aggregating them together, it would be at least 50%.
The Big Blue decks performed well today, biased by a sample size of 3 and one of them being the winner, whereas it was atrocious in May and June, sub 30%.
@vaughnbros Obviously I agree that concluding that Big Blue is amazing from this is nonsense. I agree that gush's aggregate winrate is around 50%, not sure if it's above or below without actually doing it. I do stand by my conclusion if you look at the last 3-6 months of tournament data that it suggests if you are a potential middle-of-the-road gush player you are better served by attacking the metagame than by playing a highly targeted deck.
And yes, the general idea is that for a given tournament the win % only describes what happened. Without doing this for the individual tournaments there's nothing to aggregate though. I'm mostly objecting to throwing around the term "useless".
Good job on putting this together again 
always great information and interesting read
Is the agreement to group Doomsday with the Gush archetype instead of Combo?
When I think Gush decks it more Mentor/Pyromancer/Grow strategies. And doomsday feel more like a pure combo deck to me, but I could be alone in this thinking..
@diophan I agree that Matt calling it "completely useless" is incorrect. A common thing that my advisor likes to say is: "A poor estimate based on empirical data is better than no estimate at all."
@TurboK Matt posted about the issue of classifying Doomsday months ago when we started this, in a thread that completely derailed. In our original metagame analysis we put Doomsday with gush, and we've/I've kept it that way for consistency's sake. I don't have a strong opinion either way.
I ran into that when I was listing the deck archetypes for each player. And at first I wanted to list it as Gush because it plays Gush and operates with the Gush "rules" and that's the easiest way to classify it quickly. But I agree the mindset of playing the deck is more like Combo. But I believe the main archetype and the sub archetype are sort of interchangeable for this deck. You could call it Gush Combo or call it Combo Gush. The metagame breakdown takes into account the first word.
