The invisible walls.

All the zones feel like boxes, it removes all the enjoyment of exploration knowing that the dev cut off the path in front of you.
While there are many quirks and little details found everywhere, there isn't really anything to discover. It just lay there in front of your eyes.

I would have liked to get lost in the world. I would have like to discover a path that only a few know about. I would have like to erect a secret base for me and my friends.
But we can't, not in this world.
We are bound by the convenience of teleportation, warping, instant acces to content and a paved progression.

Don't get my wrong, I like that aspect of the game since I often have little time to play.
But at the same, I hate that we can't get out of that world-box.