The problem with Horizon's world, if you want to call it a problem, is the ways you interact with it are very few. There's combat, and that part is not at all shallow, but it's one thing. There's stock, linear dialogue and there's a really basic economy. I suppose there are text and audio files, because who doesn't love those. That's a limited range and you're made familiar with all of it in like the first 3 hours, the combat expands, but nothing else. For people looking for conventional RPG "depth" it may look empty. I've been watching people play Zelda and that thing is on another planet, but of course they're not going for the same thing. Combat in that game is sitting at the back of the bus.