My printer has Chinese extruders and seems to work fine, actually the whole printer is Chinese. I've never had any other printer so I cannot really compare. All I can say is that I have never had any of the issues I read about in forums, such as jams, ooze and so on. Could also be that I am not placing too high demands on it.
Actually, for accuracy's I have had some jams but none were attributable to the extruder, such as filaments with very inconsistent diameter or errors in the gCode