The airport is big but poorly designed. Lacking in...

The airport is big but poorly designed. Lacking in signage. It's like a ghost town at 9pm where everything is closed. They have free wifi.... However it's too cumbersome to log in. Very little choice of restaurant. Air China has its own lounge at terminal 3 however you have to book ahead. You can't just logon in the internet and book. I'm sorry but most staff can't speak English and weren't helpful. Those that rate this airport 3 star and above really need to travel more and check out airport like in Singapore or South Korea...... What a world of difference.
I wanted to leave feedback at the airport ... However there is no suggestion box to be found.
I expect a lot more for modern China.