I think there is in some ways more that could be done here, it doesn't end up being as exploitative as expected. Your lead into the movie advertised as one thing but is in fact another. The fact of the matter is that asylums were truly terrible places and require perhaps a more carefully crafted script and perhaps in this instance a female co-writer.
Not as lowest com-dom, nor subversive as its critics/champions made out. Its grander themes are never fleshed out, but it has some incredible video game/comic book-style sequences that make it cool fantasy-in/on-fantasy. Not satisfying in story-terms, but feels like it's trying to do something new - Snyder is a skilled visual storyteller, though should maybe be working at Rockstar Games. A future cult fave.
Perhaps the purist manifestation of the duality of modern Hollywood's dizzy heights of wasted effort: breathtaking visual aura serving a surreal fairytale in which guns, explosions and industrial scale death solve everything. Wonder what DW Griffith would make of it.