I finished it recently. It's a fantastic, but flawed game, though the flaws are more due to what isn't there more so than what is. What I mean by that is that we've all been spoiled by Rockstar and their technical achievements for an open world. Both in terms of physics and for details, especially in the NPCs, giving the world a more dynamic and lived in experience.
I'll give you an example: in this, you come across bears in the wild. The encounters are just sporadic and always scripted, meaning that usually when you encounter them, there's two mongols fighting with it, usually being tossed around to draw your attention. In RDR2, you come across a bear randomly, and it feels like a life and death situation, especially if it's a grizzly. You've literally a split second to dead eye it in the head before it gets you and rips you to shreds. If you've got bounty hunters on you, I've been in situations where I've been chased by them, only to come across a bear, and then the bear gives chase to them and a hilarious panic ensues as they try to either run or take it out. There's interactions between NPC's that actually remember you too, so if you dusted one of them down previously, they'll either avoid you next time or just draw pistols.
All of that kind of stuff is almost completely absent from GoT, and it's not a slight against it, it's just that you wish it was there. Like RDR2, ghost is going for a locked down historical theme, so it has to be somewhat realistic, and that's what hinders it at times, because sometimes you just want it to break the monotony of constantly either just killing mongols, ronin or bandits. Breath of the Wild is probably the most similar game to draw comparisons to, but then again, that game has a litany of physics based systems in place that vary the combat and the gameplay. Having to craft or cook recipes to survive certain parts of the world early on, or trying to stay cool by keeping in the shade. There's none of that to fall back in here. It's strength is in it's setting and it's combat and progression system, which are both benchmark setters.
All in all, I'd probably put it in the same bracket as something like Horizon Zero Dawn. A great first foray into a new ip for Sucker Punch, similar to what Guerrilla Games did with Horizon. I found HZD to be flawed in it's progression system, but still had fun combat and an interesting world. That game just got stale beyond a certain point for me due to the progression imbalance or stagnation. Ghost doesn't suffer from that, and the story has enough dramatic beats to it to keep it compelling. I'd give it a reluctant 9 overall, but realistically, due to the repetitive nature of some of its mission design overall, it's probably an 8/8.5. It's a fantastic game, and it's worth the accolades it's been getting.