Most of the Chinese DVDs I've bought have been poor quality or menus that are in Chinese. Plus I've had several that were the camcorder in the 3rd row BS. I've also had many of the DVDs purchased there go bad on the shelf at home after a few months. Upon close inspection it appears that the internal layer is oxidizing. As a minimum I would burn another copy when you got home if you want to preserve the movie.

I now try to buy all my DVDs in Penang. English standard with English menus and most have been of high quality. One caveot, if it's currently playing in US theaters at the time of your purchase all bets are off. If it's been released on DVD or soon to be, you should be able to get a good quality copy.