I'm pushing a lot of film criticisms onto my mind's stack of 'possibly groundless convictions' these days. I keep seeing complaints that a) a good film needs you to 'care' about the characters who must have 'emotional depth' through 'development' b) a good film should not be pre-occupied with 'exposition' or 'explaining' what is happening but... says who? They sound like half-baked ideas that arm-chair movie critics…
As for the exposition point, I think something can be said in defense of the story in the link.
(Spoilers follow.)
Re: emotional attachment. One of the things that annoyed me about Inception was that the big reveal of what happened to Marion Cotillard is totally internal to the weird mechanics of the world. She got driven crazy because she had to be manipulated into giving up the dream world. Erm, okay. To me the main plot with Cillian Murphy had a more interesting core: a guy's self-understanding in relation to his inheritance and successful father. Both are shallow and not "deep", both "develop" in the movie, but the second has some meaning to me and the first doesn't, and it seems to me to be a real advantage.
Re: exposition. I agree that one can get overly concerned with this. But I think it's annoying when exposition goes on during the entire movie, so that rules are introduced in order to explain something going on right that second. For example, all of a sudden it matters whether or not you die in the dream world, and it has to be explained why. Or the elaborate and (to me) cool idea of worming one's way through someone's subconscious by constructing labyrinths and stuff is suddenly thrown out in favor of action sequences involving a "militarized" subconscious. It makes the movie feel more ad hoc and random.
If the movie is going to just be about the mechanics of a world with weird rules, then fine. It's not favorite cup of tea, but I can definitely appreciate it. But there are better and worse constructions and presentations of artificial mechanics, and more and less involving plot vehicles for exploring it. Though some of Kirk Hamilton's particular complaints strike me as silly, I overall agree with him that Inception was inferior to the Matrix in this regard. If anything I think the right analogy with Inception is the second Matrix movie.