Incomplete instructions. No drill size for hanging the cabinet to the wall. Tried different sizes and none worked. Very flimsy mirror door mounting. Small screws into MDF will not last.
On the cabinet side, 4 holes in the hinge but only 2 holes predrilled in the side of the cabinet. Can't imagine what someone would do with no DIY skills.
Either provide better instructions and let people know or charge more and provide better quality. 
Good things aren't cheap,  cheap things aren't good.