Most of things you listed are done in a lot of countries. 1 & 5 are done in countries like US or France after terror attacks. China also have to deal with the islamic menace, so it's not surprising they implement 6. Passeport registration in hotels is probably done in most country of the world (at least all I visited). Cute police character is something totally normal in Asia (here is a Japanese example http://www.pref.kyoto.jp/fukei/foreign/kansiki/shomei.html). Camera are everywhere in every big city.

Finally, the only (scary) things really specific to China you list are the milice and the fact they clearly told you have no privacy right.