I kind of enjoyed Valhalla ... but maybe that's because I'd never played any other AC games in the past, so I didn't have any expectations to disappoint.
Overall, on the better side of mid. General gameplay and exploration was pretty fun, world was very detailed and beautiful. The AC parts seemed a bit shoehorned in. Hated the arbitrary parkour challenges, and really really hated the modern-day meta storyline. Kind of wish they'd just have let all the AC stuff go and just made a fun Viking game without any of that other bullshit. Still, I enjoyed playing it for quite a while. Maybe I'll play it again someday, but it's definitely not on my shortlist of replayable games I keep coming back to.