I enjoyed this game a lot, so if this post sounds negative - I don't think the game as such is bad at all, but there were various things I did not enjoy, and I actually skipped quite a lot of content, which is a downgrade for me after Odyssey where I did everything.

Worst:
Anomalies - gave up on them
Tattoo Papers - Didn't bother with most
Cairns - gave up on them, though much later than the anomalies
Drinking game - sucked at it, felt no desire to get better
Norway - too much time spent here before going to England if you try to do everything
Pacing - too hard at the beginning, too easy at the end
Lots of stuff in the world gets repetitive, including curses, mushrooms and last but not least loot, where the effort to get at it often doesn't feel like it was worth it.
Best gear comes so late in the game it feels pointless.
Opal farming - very repetitive quests.
Zealots - not being able to use assassin tactics on them - at least it didn't work for me. In general, I'm not keen on being forced into tons of 1:1 fights in an assassin game. Mercs in Odyssey were a lot better.

Good: Story was overall great in the game imo, same for the characters.
Dice games
Flyting
Settlement - in general decent though it could have been better (I felt no desire or inclination to do the hunting or fishing content, both bc I don't enjoy slaughtering non aggressive critters in games and bc it just felt inanely grindy). It felt a lot more part of the game than similar elements in, for e.g., Black Flag.
Skill tree and some of its features, especially missile reversal.
THE CATS.

I'm gonna give my opinion too. I really like Valhalla and I'm hyped for the upcoming content!

Worst

• I wish more Order members, especially the last line before the Father, had something to do with the main quests (the last line before the Father just has two of them).
• I wish we could have more "real" romance options (not just flings) because none of them interests me and it's usually a feature I like. I feel like Vili should have been a real romance and not a fling, and I still hope Hytham could be romanceable in a future DLC.
• I wish we could have a list of the sidequests in our menu
• Not being able to use "assassinate" on the Zealots. In Origins and Odyssey, we could to it, even if it didn't necessarily kill them.
• Some cairns, like 2-3 ones, were too complicated and I spent too much time on them xD
• Fishing

Best

• The story and the mains quests
• Pretty much all the characters. I was always so happy every time I could see them again!
• The modern day is much better than all the recent games, definitively my favorite one since Desmond.
• So yes, I really enjoyed the anomalies!
• The settlement
• Orlog
• The fact that we can interact with animals

@gloomseeker You have some good points, especially the notes and the arbalest. I think Reda is kind of funny. I guess he's supposed to be an Isu.

Another thing I forgot is that dumb desync threat for killing civilians. I never actually desynced, but if we aren't supposed to kill them, they should make the AI better, as most of the time it happens when they walk right into a fight. Who does that? I also feel they should make more of an effort to have synchronicity between games as in Origins we had that too, where we were informed a Medjay doesn't kill civilians, but in Odyssey you can go on an outright rampage slaughtering hundreds of civilians both b/c they inanely bumble into a fight or b/c they catch you stealing or killing a guard, and then they attack you in droves wielding brooms, or sometimes some frail looking lady with a crap ton of HP picks up a massive 2-H weapon and swings at you with that lmao, after which you can then just go and kill the guy who put the bounty on your head and everyone's forgotten xD Then in Valhalla you can walk into people's houses, rob them blind, eat their food, burn their houses down, kill all the guards in the town, pillage their churches yet suddenly your guilt meter kicks in when someone bumbles into the middle of a fight or gets hit by friendly fire? Seems the point is, much like the ethnic diversity in the settlement, to challenge people's preconceptions of what Vikings were like, but it could be done better.

While I enjoy the NG+ in Odyssey, there's stuff that makes no sense, like the shards to upgrade the spear or Barnabas saying the ship needs upgrading. While it's not important, it wouldn't have been hard to just cut that.

@gloomseeker Chickens attack you in Valhalla too. Unsure why, but I managed to aggro them multiple times xD