OK, here goes:
The Everblossom Sleigh - A poor grand prize and a mediocre evolving building at best. Fully evolved it provides a small amount of population, culture, T2 goods and seeds as well as a decent amount of coins. The coins can be useful for some, but everything else is startlingly underwhelming. To be useful this should have at least one more thing that has a quality pay-out. If, in addition to 630k coins (Ch.15), it was also giving 63k supplies, then maybe I'd start thinking about it.
For me, evolving buildings were occasionally really good (i.e. 2019 Phoenixes and Bears), but otherwise I would have thought that they'd be short-lived novelty items. Packing several different things into one building in non-meaningful amounts, is unlikely to appeal to many people. The inability to teleport them also just makes them stay sat in inventories because no one wants to build them as they may just end up having to lose them. The reason that the good ones were good was because of the one really good feature. Not because of the extra bits and bobs they also offered.
Personally, I long for a return to the old days when the grand prize was just a specialised item. I would be much more interested if a really good culture/pop building was being offered, equivalent to a Venar's Rocks III. Equally good would be if it was a specialised goods producer like a Jester's Tavern, but there is nothing exciting about having several poor rewards in a building.
Quests - The questline was very simple to complete (which is not a compliment), but also incredibly tedious because now the same quests get repeated over and over, quest to quest and event to event. I understand the desire to move away from the building of shanty towns and people referring to "cheat sheets" to complete them, but the execution is all wrong. I would much prefer the old system involving "complete 10 x 1 day productions", etc, because at least there was something to do in order to strategise and decide how to play it. In those days you absolutely wouldn't get through the quests unless you gave it some thought, so some strategy was required, which led to a sense of achievement. Now I'm just either bored to tears with it, or I just ignore it completely and the quests more or less complete themselves anyway, so long as I keep clearing provinces.
Daily 'Exclusive' prizes - As always there's some great artwork, but the standard of prizes goes steadily downhill. For anyone who's been playing the game a while there's no longer any incentive to win any prizes because they are less good than the ones they had before. As tournaments have been made so easy to win blueprints in every week, no one ever needs to replace buildings with new ones because it's much better to keep the older, better ones and upgrade them with the (freely available) Royal Restoration spells.
Sadly, even the returning daily prizes held no interest for me. Partly this is because I was never into the whole idea of floats, which is what 90% of them were. There should be more variation, even if there is a certain theme. I will happily go after, and place, a building purely on the basis that I think it looks good enough. I recently spent 4,400 diamonds on a premium pure culture building from 5 chapters ago, just because I thought it would look good in my city. That's the lengths I will go to if there is something that I think looks the part, but these days I feel like I've done well if I find one event building in a year that I think is in this category. (For the record, I'm looking for buildings that actually look like buildings. I want some really cool castle-type things, particularly, or something showing some amazing building architecture, that you can imagine being in a medieval city - even if it has a fantasy twist to it. Yeah, yeah, I know that's just me, but my point is - have some variation so there is at least something each event which might appeal to different groups, aesthetically).
Filler prizes - Again these just go downhill. KP daily exclusives now often give less KP than some chest fillers, but neither is great. Troop instants are a good idea, but they get steadily more nerfed. I would also be much more interested if there was an option to win Merc Camp troop instants. Looking ahead to the next event, this is only going to get much worse again.
So, all pretty negative, but at this point I can't see any end to the tedium. The concept of evolving buildings was a nice thing to try, but we've now been bludgeoned to death by them for two years. Please try something new, Inno, or at least go back to some of the older ideas.