Yeah, I'm with you on the repetitiveness of the game, but that's every open world game, all have bloat, grinding, repetitive side content, checklists etc. Then we should harshly judge every open world game, even Witcher 3, (not exactly comparing them, just as an idea) which is regarded as one of the best of all time had these things, even had trashy combat. Not one time I saw a game trashed for repetitive stuff and another praised or not, but getting a pass.
I'm like this, if the gameplay loop is good, then I'm fine with repetitive part, I mean the gameplay/combat here isn't trash, the AI is braindead yeah, but it's okay, there is variety, it's fun-ish, it isn't something groundbreaking.
Maybe it looks like it, but I'm really not defending this game, I hate the endless collection of weapons and armors, I hate that they still do the vantage point marking stuff on map thing and if that wasn't enough you can unlock points of interest in those safe houses and also with the random repetitive encounters, that's insane. Maybe I was a bit generous with a 8.5, but it's definitely better than Valhalla.
AC2 was amazing but the combat I didn't like, with how everyone stands around you waiting to die, I remember all the AC games up until Origins as "Counter" the game.
I agree about the first hours, it's great, and the Yasuke flashbacks, those felt like were created by another team. But I don't know how AC can get the story right, they sort of backed themselves into a corner with all the going back and forth in time, maybe a more self-contained, personal one, ditch a bit the open world, make it interconnected smaller areas, don't know.