Personally, I haven't enjoyed this set. I was never around for Dominaria so it doesn't have that same sense of history to me but this set felt very rushed narratively. They uncover the phyrexian plot, form the coalition, a city falls (I think??), and they have a massive battle which seems sort of climactic. It's possible I was reading quickly but this just seems like a series of big events with little to no build up, sort of like how they got all the guilds to align in the War of the Spark book (particularly with how easily and quickly they fixed Trostani).
I was heavily bothered by how fast Dominaria's been infiltrated and how much. So many people were compleated and it just seems so fast. I suppose that the Phyrexians have been improving and perfecting their technique but on Mirrodin it felt like a seeping sort of corruption and here it is explosive.
I also hate Karn. As a character, I find him whiny and like he was given the idiot ball. I do not know him well, but the fact that he spares phyrexianized people is beyond stupid. This whole plot could have been averted if he just killed Rona and threw the bomb. He can make more, could he not just napalm the heck out of Sheoldred. But no, you stuff your "tongue" hand in her like "what could possibly go wrong
" This could absolutely come from me not understanding the character outside of a few short stories and the novel Quest for Karn but has he always been indestructible? He seems so self-assured that I get the feeling he has never faced a real threat.
I also feel like the Weatherlight getting compleated (how did it seem like a good idea to not even take time to remove the Phyrexian gunk from her and cleanse her and give her breaks?), Ajani's completion being revealed, and Jaya getting killed could've been climaxes on their own if played right. Instead they were thrown one after the other.
I'm not normally so bitter about a set so this is likely just a matter of "I'm not the target audience" than it necessarily being bad. Also, forgive me if I seem a little ranty!