Does the United States have problems? Yes. Are those problems on the same level as China? No.
For the sake of argument, stipulate the US is not right now on the same level as some despotic states. What is going to tell us that we've arrived, next week or next year, if anonymous security forces can grab people off the street with no accountability? What sounds the alarm, that the feds are not doing things correctly, or that someone is pretending to be the feds, who kidnap people?
However, the US has absolutely huge issues that are much worse than anything comparable in China. Such as, I don't know, fabricating intelligence and feeding it to propaga- I mean corporate media in order to justify a war to kill over a million innocents.
The US is not better than China as far as human rights. There are some things that the Chinese do much worse than America, such as due process, in general - not in extreme cases, where both don't hesitate to extraordinarily rendition you into a black site. However, China also doesn't have the habit of turning a few million innocents into pink mist every decade or so, so there's really no argument of moral superiority you can make here. US problems are certainly on the same level as China.
And as far as detention, the direction the US is going certainly isn't the right one, either.
https://en.wikipedia.org/wiki/Category:Territorial_disputes_...
If you want to limit the ability of superpowers to kill millions with impunity, then really the best solution is to have a bipolar world.