Scouring over the EW decklists. Some things of note as I scrolled through:
-pretty good amount of Painters, Food Chains, Enchantress, Pox, and Gaak
-a lot of RG lands, Moon Stompy, Bomberman, and Dredge
-at least 2 decks with Ill-Gotten Gains (both Painters iirc); that's just good, clean livin'

In terms of Dreadnought:
-one severely underpowered mono-U list with 2x Renegade Doppelganger and no Scrolls. Other creature was Delver (and Dreadnought ofc). Pretty sure this was a direct netdeck from ewlandon's 5-0.
-Didn't really scrutinize SBs too much, but that's all the Dreads I saw - maybe one of the many RUG Delver decks had one sitting in there.

Team Tundra stacked the box real hard and only got 6 slots of the top 70. These decks clearly were not stopping RUG's Wrenn/Oko, and probably ultimately boosting RUG's performance to no small degree. It's somewhat humorous watching the whole "CB is bad right now" when that's the only card in their deck that has ever mattered. The Hogaak decks likely ran into profound trouble with Oko Elk'ifying their 8/8s. Reanimator apparently got massacred (Dredge as well, but much lower in overall number); their spell-based yard combo brethren [ANT] blew them out of the water. Honestly not surprised to see DnT finding good matchups near the RUG-shaped apex, and having a fairly strong showing.

In terms of general trends, the Karn decks were playing super hard into enemy Karns. Probably a lot of completely variance-based self-kills in these mirror matches, but likely predictable that the Karn stompy deck with the best attacks [Mentor] seemed to do the best. Lots of weird Teferi [mis]use going on. Most of the UW guys figured out the whole "play this card with Astrolabe" trick, but Teferi is clearly not addressing the problems they are having (especially against Oko). Rather humorously, lots of combo decks were throwing in some Teferi (Infect, OmniTell, UW Helmerator, and like every Food Chain deck)...and it kinda seems egregious - like what are you bouncing to generate velocity [when opponent's don't have a worthwhile target]? I'm sure it's fine for them, but it's kind of being used like a 3 mana discard spell vs enemy countermagic. I don't recall seeing a single deck using him correctly [with manlands].

I wish I could have made it out there; RUG is a pretty boring coin flip to play against, but most of the rest of that meta seems pretty reasonable for us.