The Human Rights effects it, because they will never be able to develop into a fully fledged more economically developed country until they have sorted out all that kind of stuff. Until then they will be considered a NIC ( newly industrialised country) and can't become members of certain international schemes.
Okay, so they can be super powerful without being classed as an MEDC. But it's very rare and the two usually go hand in hand, remember to truly be a succesfull super power you have to have people that like you and respect you, and ofcourse trust you.
China also needs to get someone new in power and stop being Communist, it's hard to trust a communist country..