There was a thread earlier about most enjoyable open worlds and I wanted to talk about Xenoblade X's world but couldn't really think of a good way to really show it off with a few pictures or gifs but then I remembered finding this really great video that kind of encapsulates just part of what makes X's world so great.
Something the Xenoblade X does really well with its world is creating a sense of scale. When you first start out, you're in a little narrow passageway where Elma finds you. Everything is close up for awhile but as soon as you step out into the main land of Primordia, you really get this awe-inspiring sense of scale. The way they put these massive natural landforms stretching out in front of you make you feel tiny in this huge world and as you explore it, you start to connect all the stretches of distance between the landmarks and piece the world together because you have to really navigate every bit of land to get to where you want to go. Tall cliffs and trees push you down to lower paths and you have to really pay attention to all the little rivers, boulders, hills, etc. to get you from each huge landmark to the next. Then you get your skell and suddenly you're 5 times bigger and the scale of the world is completely different now. You shift from this micro view of the world to this macro one where now all the exploration you experienced is almost compressed and now huge areas of level design you traversed on foot one way become completely different in this new context. Xenoblade X is just extremely good at this and I don't think any open world game does it this well.