Let me know how you feel about it after some time putzing around the countryside. I actually fell off the game after a few hours in England. There's only so much of "muddy and ugly" that I could handle before I got bored, and Eivor hasn't show anywhere near the charisma of Kassandra or even Bayek.
I'm 30 hours in now, and I've cleared two regions of England. So far, I'm actually digging the game a whole lot more. The opening is just really brutal and crushing with how boring it is, and how bleak and empty Norway is and how limited the game's mechanics are that early. The game really should have just started off with the England section, then gone back to Norway as flashbacks if they really felt that part of the story was important.
I'm not really finding England to be "muddy and ugly" so far. There's definitely ugly muddy medieval junk in the game for sure, but there's generally a pretty wide variety of stuff in the setting IMO. At the onset of the England phase of the game, you have basically two options of where to go. If you pick the option to the north, that region is definitely full of mud and yuck, because it's a particularly war-torn area that's also full of a bunch of poverty due to mismanagement/neglect from the King of Mercia. But even in that region, the forests are lush and green and full of vibrant color. Maybe having HDR enabled is helping me here, but the only thing I'm really finding ugly is some of the character models, which are generally ugly on purpose as a design choice (lotta people with busted medieval faces) but occasionally ugly on accident (there are points in cutscenes where characters faces just stop animating for a few lines of dialog with hilarious/awful results) but it is generally a very beautiful game. Especially just from an environmental perspective.
I'm coming to terms with the leveling system in the game. It's a step up from Odyssey if only because there's no enemy level rubberbanding, and the psudo-sphere grid gives players some level of freedom to cater to preferred playstyles, but I still wish they just went back to Origin's way of doing things which just worked.
The gear progression in this game is completely dogshit. It's not an impediment to me because of how I play these types of games where I compulsively complete every map objective and snag every treasure chest. But your ability to try out new weapons and keep them upgraded is very hampered if you're not doing that to the point where I can see it being hard for someone casually going through the story to keep up and feel good about it. One annoying thing is that there's no more Elder Scroll style stealing in the game. Which on the one hand, means no more getting in trouble because you pressed the wrong button. But there was one instance where I went and stole stuff, and a certain NPC I was now an enemy of theirs and I wish I'd known that before because making alliances with people is important in this game and now that person is dead and not an ally.
So far I'm liking this game a lot more than Odyssey. Big improvements on a lot of stuff, especially being able to assassinate anyone, even elites. (You just have to have a special ability unlocked, and then successfully complete a QTE timer) Eivor is not Cassandra or Bayek. But she's (I'm playing dual-gender, but the game hasn't forced me into male-Eivor yet) her own kind of fun so far. She's kind of a jackass, but in a fun way, where she's always getting piss drunk, or doing all kinds of drugs and waking up in strange places. I just completed a side quest where my solution to a pair of squabbling siblings was to just burn both of their houses down. If you want/need your characters to adhere to strict, modern, moral standards, Eivor might be a tough pill to swallow. (It's tough for me at times.) But if you can just embrace the role of being a Vikingr, there's a lot of fun to be had. I also highly suspect that they're going to take Eivor down a Vinland Saga/Thorfinn route because she's already questioning the wisdom of burning/looting everything, and being swayed by people who just wanna build cities/farm and do commerce.
Edit: Oh, one major improvement in the game is that you can teach horses how to swim, so that is probably the biggest quality-of-life improvement ever for this franchise.