The world just felt so empty to me. I mean, I love exploration in games and that goes hand-in-hand with big open worlds, but BOTW didn't really do it for me even after 20 hours. Very little variety in the landscape, flora and fauna, repetitive goblin/moblin encampments, static NPC's with next to nothing to say. It was almost certainly due to technical limitations / performance. The game was ambitious, but you can tell they hit a wall.
Edit: And, yeah, I'm also in the camp that missed traditional Zelda bosses and dungeons. =/