I'm willing to bet China has the worst coffee in the world.
Chains, like KFC or McDonald's, serve their coffee with cream and lots of sugar (one Chinese sugar packet being the equivalent of about five American ones) which should always be used, as the coffee will taste bitter and bland.
From what I've heard, most of their coffee comes from a powder, and you can often see clumps of the residue at the bottom of your cup.
At one point I was served something made with actual coffee grounds, but it was served with the grounds still in the cup, contained in a rather large tea bag. Needless to say, it was strong:
Also, the Chinese have no idea their coffee isn't good and love serving it to Westerners. Be firm in wanting to try some of their "amazing tea" or bottled water.