On my phone so I can't respond to your whole list (most of which I agree with), but I disagree about the world being too large. As I was wrapping the game up, I wanted to defog the map, so I decided to ride from Siwa through the western deserts and down to the very south of the map. Like you said, it's pretty much completely empty; no question marks, not even any animals. It does a great job feeling like the endless desert of the Sahara. And then, after 15 minutes of riding through nothing but the occasional hallucination, I stumble upon that gigantic otherworldly tomb at the bottom of the map. And it made it feel special. Cresting yet another dune and seeing this sprawling canyon appear is one of the best moments I've had in the game. You wouldn't get that if they stripped out all the empty places.
Guess I understand from where you are comming from, but that really wasn't the experience that I had with these areas. Maybe it was, because I found that otherwordly tomb 1st and then went into these empty areas expecting to find something else. But maybe it was also, because it felt like filler content that doesn't have any other real purpose. The game has several nice locations, no doubt about it, but these empty (or mostly empty) locations felt unneeded in the end. At least to me.
Just got the game, and I'm Level 3. I can't seem to toggle on the hood? I'm on the Xbox.
Any help?
It's probably locked until a certain mission is over. Would make totally sense, but I'm not sure.