Wow, this is actually awesome. Some of my thoughts on the data:

Win rate is... not what I would expect. Yssaril is #4 in win rate? Winnu is above Saar for 6p? At advanced, Yssaril jumps up to #1 win rate.

I'm not surprised Mentak is below average. I've seen quite a few people play them wrong, and I see a LOT of people that take them not because they actually think they're strong, but because of how much they don't want to play against them. I think they're solidly middle of the pack, but very easy to mess up since their fleets are weak and negotiations are critical to doing well with them. Also looks like they took a pounding after omega cards were released, which I have no explanation for.

I think Xxcha's win rate by skill is interesting. They're definitely a faction that always does OK, since they are so defensive, but it's when you learn how to negotiate well and get the full value from quash/instinct training that they really become strong. They're the only faction I could see that doubled their win rate from beginner -> advanced.

Hacan winning popularity also isn't surprising, given the traditional bans. But I am surprised that so many people don't ban Jol nar/Sol that they are able to get 2nd and 3rd, honestly. Also surprised that Saar is so far down the list.

Average game length I don't think is super useful, just because the difference between the factions is only 30 mins. A bar chart with standard deviation would probably have a bit more information, but that might be going overboard since I'm not sure how useful the stat actually is. But I think it would be interesting.