DVS isn't saying it didn't work for him; he's saying it was a basic, softball level. You called it an allegory but an allegory is a story with a hidden meaning. There was no hiding anything in this. The scene about brainwashing was literally kids in a classroom getting brainwashed. The scene that reminded you of Rodney King was a black woman getting beaten by a cop-type guy. The class of people in the world were the class of ticket they had on the train.

The train was an obvious microcosm of society. If the nail on the head manner it was presented works for you, great. And it being nail on the head doesn't mean it wasn't done well, it just means it was nail on the head. If you like subtlety, nuance, or films that cover their deeper meaning at all, then this film will seem like a softball.