I'm shocked that all of the Heroes Of The Hall are not here. No Cattie-Brie, Wulfgar, or Regis. Or even Cadderly and his group. We still have the Commander decks but I don't think would be weird to not have them in the set with Drizzt and Bruenor.
Seeing the whole set I have two major questions and some thoughts.
1. Is losing the core set going to impact Standard too much? We saw what losing core set for years did to Standard and considering we only have single digit reprints in this set could it be possible the loss could once again negatively impact Standard both before the much needed rotation and even after even when Ikoria and Eldraine leave.
2. Did this need to be a D&D set? Honestly, it seems like besides very specific places/characters of D&D a majority of what see here in this set could have showed up in Magic normally. Even D&D owned monsters could have showed up, since WotC owns them, like Beholders as an example. I feel like if you throw out the legendaries and the +2 Mace this could have easily been just a normal Magic set.
As their first real attempt with crossovers and with UB on the horizon I look at this set and how well WotC adapted D&D to the game and overall it's....not promising for the future. I can't speak of many of the legendaries (as I only know Drizzt, Lolth, Tiamit, and The Deck), but the overall adaptation of D&D here is not very good. The Tarrasque and other simple D&D spells are not done well (Shocking Grasp and Ray of Enfeeblement as the worst examples) or miss the mark (The Deck of Many Things) which is strange as they literally have 5+ editions to correctly translate them into Magic.
When it comes to LotR and Warhammer coming up I have no expectations as I am only familiar with LotR and not to crazy degree, only movies, but even so I look at this set here and with it feeling a bit underwhelming I can only wonder how well they can do it with franchises that will be much harder to adapt to Magic. When you see that D&D should have been fairly easy to do and seeing easy T-Ball pitches being made and still missing it only cements the idea, at least in my mind, that UB might only do well financially thanks to collectors rather than for game play.
In the end this set is just kind of okay, it has some neat things, but did nothing to assure me that these UB/crossovers are a good thing for Magic as a whole. I like D&D, and out of all the UB stuff I like this the most, but I still feel this should have stayed the far away from Magic.