NA servers full of Chinese players?

I believe in this case you were likely put in a game located in different region servers. Setting your region doesn't guarantee that you won't be given a match in a certain region in some circumstances.An example that jumps to mind is if you're playing at 5am your local playerbase will be much lower than at 6pm, so you might go into a match from another region which is more active.
If this happens consistently and at all times of day, a router power cycle might help, but otherwise