-Zulu, Chinese (out-expand and keep pressing with armies), Romans (too hard to use)
-Americans can beat Chinese, Romans (out-expand and build wonders to help)
-Chinese can beat them
However, many civs can neutralize these civs, but it's not easy to do and you need skill. Chinese are pretty good to win many games if you know how to play them
I got some questions for you.
What's your Xbox Live gamertag?
Which civ is the best overall?
Which civ is the best to neutralize the Americans?
Which civ is the best to neutralize the Chineses?
Which civ is the best to neutralize the Zulus?