Pretty sure Delirium boosts rarity in the map for everything? So you can't really notice it without parsing large data cause there's no obvious "here's 5 divines" shit, it's just a small buff to everything+some emotions sometimes.
Vaal looked too annoying to me, I hate when the league mechanic is about doing some external shit minigame, and especially when the payoff is ultra delayed like 20hours down the road.
Generally I have issues with every league mechanic.
Expedition is too fucking slow, largely because the new Kalguuran Remnants are too fucking slow. These shits need to be half the duration if that, it takes way too long to spawn all the waves, I only do them if I see a remnant with a good rewards.
Abyss I quite like but I hate doing the abyss secondary area if it spawns, it's pretty short but it feels unrewarding compared to just going for another map, but at least the main gameplay I like, just bunch of mobs and lots of nice chests or the invuln fucks farm if you're into that, they just buffed them to not be completely retarded by switching the uptime of their aura from 90%(tf) to 50% and move out of it on their own more easily.
Breach I overall like the gameplay, but I don't like turning in wombgifts at the tree, shit takes way too many clicks, should be able to stack them and hit that thing several times or something. Still it's fine and the defense maps aren't so bad either.
Ritual I don't mind once you've unlocked the passives but it's very build reliant due to the necessary difficulty for it to be rewarding(by stacking bosses and shit). It's also kind of a lot of busywork with the UI and you have to know what's worth anything so it favors using a 3rd party to price check(since their new price check is clunky and also doesn't work in maps).
And yeah Delirium it doesn't feel like it's worth it although it might be? Also it adds a lot of visual clutter everywhere, and it's very weird you can't get fragments until after you've done the quest for some reason. And you don't get nearly enough fragments I think? Unless a unique boss spawns it's like 3-6 per map which feels really low.