I trust, what you mean when you say Chinese Lures, is lures made and sold under a Chinese Brand. 70% of these lures for some reason do not work as well as they should. The balance is somehow not right and you have to pay a lot of attention to work them, positioning your rod tip is very important. I guess that there is no quality control procedures or tests in the manufacturing process of these lures, and so the difference I presume, when you buy a Chinese manufactured lure that is of a reputed brand.
The Lip breaks off.
The lure can split in half vertically.
The quality of the split rings and hooks in most of them are very shoddy.
The colour peels of very fast on a lot of them.
A lot of them tend to surface on retrieve.
I will give you a good example, I was fishing with a Red-White Lure that was an identical copy of an Alle Magnet, to the naked eye there the lure was almost perfect upto the action in the water as well and I could see no difference. However I was not getting hit, the moment I switched to a genuine Alle Magnet, I caught 4 fish within the span of 20 minutes and then lost the lure to the 5th fish. Switched to another RedWite copy, caught nothing, switched back to an original caught some more. It was all in the same area.
A same lure (alle copy) gold colour that day caught fish though.