Yesterday, our own Ari Lax took a look at the MTGO PTQ Top 8 from last weekend, Standard's first major, individual tournament after the release of Guilds of Ravnica. Ari's focus was on the individual card choices of the top 8 decks, which makes sense given the diversity in those elimination rounds. Those are the decks that are going to have the most eyes on them, and without a clear dominant archetype or two, there isn't a lot to be gleaned in terms of big picture ideas of the format, so it's better to focus on the small-scale choices, like individual removal spells and the efficacy of splashing or adding a full third color.
However, this was a 322-person tournament, and we have access to the entire top 32, which gives a lot more information on which decks did well and which ones underperformed. After all, the decks from 9th to 26th all finished with the same record (7-2) as the two players that snuck into top 8 at 7th and 8th, so the margin of difference here is tiny.
We're also operating in the first week of the format, when both the metagame and the decks comprising it are taking shape. A gem of a deck could fall short because it wasn't tuned properly or missed out on a key innovation, a phenomenon that's less likely to happen later on when we have a more complete understanding of the format.