I think the game is a bit of an enigma. I can totally see why someone would give it a 10. I can also see why someone might give it a 6. I haven't finished the game but I definitely land somewhere in between.
Technically speaking I think it's the greatest game ever made. Graphics, music, sound, story telling, voice acting, attention to detail. It's all first class. Beyond that I think the game is a mixed bag to put it kindly.
The mission structure is basically the same it's been since GTAV except it feels even more scripted than ever before. Go here, stand there, do this. A for a game that's supposed to be about choices it offers very few.
The controls are a mess. I think that goes without saying at this point.
I think the biggest disappointment for me is the immersion. The RPG elements range from chore like to almost irrelevant. The world while vast just feels it's the same area and characters copied and pasted. The NPCs offer little in the way of actual interaction. I was hoping for the next level of open world immersion and what we got was a slightly bigger version of RDR with a few new bells and whistles. After playing Breath of the Wild nearly two years ago this game feels dated in a lot of ways.
It's a really good game and a great technical achievement but it's also a disappointment in a lot of ways.