I think a lot of it has to do with it being such a large world, you aren't going to see everything it has to offer within a 5 minute clip. The rest can be attributed to it being a year out, and also that they don't want to give too much away.
In the end, yes, there absolutely will be areas that don't have much to write home about, but that is unavoidable. And honestly, it would be weird otherwise. For it to feel special I think there needs to be a balance. Finding a really cool place in an area unexpectedly is a great feeling.
Sometimes you don't need 'something' in every area. There is a beauty in simplicity.