Ergo proxy is probably one of the best anime of all time, really. I love it's empirical nature, too few anime require a functional brain to understand, but this, this made me happy. The plot, the characters, the depth... absolutely genius. And this isn't praising it, it's just how it is, plain and simple. If I were to go into detail I would need to take a break for a few weeks to write a book about it.
One of my all time favorites, this piece cannot be described in words. The complex situations and the reasons behind them are sometimes almost out of reach of the rational mind, it's exhilarating, you're given a piece of the puzzle and you have to fill the rest. I understand why some couldn't get past this idea and gave up trying to understand.
If you watch Ergo Proxy only for the action then you might as well not be watching it at all. This isn't for everyone, it isn't even trying to be and I appreciate that. The author of this story simply let his imagination free of any constraints and created a masterpiece, one to remember.