Some fans of Blow's earlier work seem to have been hoping that the mazes they saw in the trailers are just a veneer for a deeper, mind-blowing experience, but really the world and whatever narrative you can find in it are dressing for an incredibly impressive collection of puzzles. Whether or not you find a deeper meaning at the end, the journey will have been worth it.
Rapture's biggest weakness is bigger still, because those who are put off more thorough exploration will get less out of it than others. Some players will reach the end without knowing half the story. But maybe that's okay. You get as much as you put in, after all, and the variety in experiences will give people something to talk about.