This game is easily a 9/10. Every review here gives it all the praise it rightly deserves so I'm going to talk about the things it is lacking that prevent it from being 10/10. Everything I list below is a MINOR gripe and should not take away from how amazing and beautiful this game is.
1.) The controls. Holy hell they are shoddy.
2.) Your weapons will randomly disappear back to your horse - always check to make sure you have the guns you want. If you mount, reselect the weapons once you dismount.
3.) the inventory system is a mess. You'll always have an inventory full of stuff and never quite know where it is, what it is, or who to sell it to.
4.) you cannot own a wagon! This one really made me sad. For a game so big, that has you go hunt for hundreds of animals and pelts, you are stuck using your one horse (maybe two) to transport everything with no wagon!
5.) camping moves you on the map. Minor gripe but I want to be able to choose my camp spots, not get teleported to a preselected one.
But like I said - these are all MINOR gripes. The game is easily one of the best I have ever played - just needs a small amount of criticism where it's due.