I've played a ton of games on NDM Ubers and here's my initial thoughts:
The good:

: Certainly not as dominating as in regular NDM as the usual defensive core of Heatran + Gholdengo + a Flying-type is power crept here, but Ferrothorn + Fighting neutral + Dialga is easy enough to fit, Steel also has a decent variety of options between Necrozma-DM, Magearna, M-Lucario, and Genesect, so it's still decent overall.

: Has a ton of options as Game Freak loves box-art legendaries of this type, and while Eternatus and Dialga are virtually a must have for such teams by providing a sturdy defensive core for the types Dragon is weak to, they have every role they could want covered.

: Similar to Dragon as Psychic-type legendaries / mythicals have been a thing every generation, this can go as either Trick Room with Calyrex-I and Hatterene, or as just plain Psyspam HO with Tapu Lele and a ton of setup sweepers to pick from. The lack of viable switch-ins to Ghost-types still limits such structures a bit, but they totally have the offensive pressure to not autolose either.

: Has every role it could want while also having good speed control options like several Sucker Punch users and Choice Scarf Greninja / Meowscarada, the pool of options may not be too wide, but it has just enough to be a legitimate part of the meta.

: Even though its pool of options may seem low at first, Fezandipiti + a Steel-type grants a nice defensive core to work with, this is further complemented by Mega Diancie compressing a variety of offensive and anti-HO roles, and from there there's multiple options to pick from, most notably Arceus-Fairy, Zacian, and Flutter Mane.

: Arguably the most broken type in the metagame right now. The ban on Primal Groudon has enabled structures of this type to have more freedom in their coverage options, with Kyogre in particular sticking out as Scarf + Water Spout has been raising as a set that can blow holes on teams at turn 1, with its amount of switch-ins, already limited in regular ND Ubers, becoming only a luxury for a few types (Steel, Dragon, Water, Ground, Poison, Ice), and of these such stuff is only naturally ran in Steel, Dragon, Ice, Normal, and Grass (Dialga, Ferrothorn, Kyurem-W or B, Chansey or Blissey), being near unviable otherwise (and that's still excluding how niche/below average some types are either way).
The meh:

: With Primal Groudon and Zygarde-C banned, this structure now kinda sucks, Ground teams are just glorified regular NDM teams with Arceus-Ground, Ursaluna-B, and Landorus as near-mandatory slots. Base Groudon is also technically an option, but it doesn't really ease Ground's matchup into anything beyond enabling Weather Ball Landorus, and overlaps with Arc-Ground, additionally requiring to fit Gastrodon to not autolose to Kyogre doesn't help.

: With Ho-Oh, Chi-Yu, Reshiram, Ogerpon-H, M-Blaziken, and maybe Arceus-Fire, Fire is quite limited, leaning towards a Bulky Offense direction, but it can also easily work as regular offense if a sun setter is added, still rather niche as the Stealth Rock weakness limits their options, especially given the inability to fit boots.

: With the Steel-type part of its defensive core power crept, Flying teams are limited to BO, which is barely workable with the pool of options, there being barely any Flying-type resists is a nice niche for this type at least.

: Typically locked to BO and HO as such type lacks a proper switch-in to Ghost-types compared to regular NDM, the lack of viable hazard setters also means that Annihilape is surprisingly inconsistent.

: Locked to HO as there's barely any defensive core to make, the mega slot also faces strong competition between M-Blaziken, M-Lucario, and M-Mewtwo X, MMX is typically to be considered first given Zamazenta-C is also a thing.

: This is basically limited to HO as all the Ubers for this type lean offensively, so by nature it's rather cheesy, but not the worst thing.

: Carried by Extreme Killer Arceus and Ditto, there being no good Fighting-type switch-ins renders these teams with an high skill floor, so teams of this type can be fishy.
The bad:

: There's barely any Rock-type Ubers (literally just Arceus-Rock), so this one is just unviable.

: Similar to Rock as it only has Zekrom and Arceus-Electric to work with, but that's for the best as Miraidon would break the meta in half.

: Similar to the above as it only has Shaymin-S, Arceus-Grass, and Ogerpon-H to work with.

: Use Dragon instead if you want to use Eternatus, the rest of the options for this type are just underpowered.

: Has no role in the meta as other types can do better in any niche this can do, there being barely any Bug-type Ubers doesn't help.