Steve, China is what it is. I can't see Guangzhou being any different to other parts I have seen here. If you have a longer than normal stop over 'and' are allowed outside (which I am not sure if allowed) then treat it as an eye opener. It is very different to the Philippines and I think Hong Kong where you have been before. I don't know what the city is like, big by the looks on Google, I would treat it as a new experience. China is a strange place but also fun to be an observer for a few hours.
If you are restricted to the airport.... good luck lol