1, Have yet to launch an aircraft from a carrier using rail gun technology
2. Catchment ropes of poor quality resulting in aircraft continuing on and into the sea.
3. Not so good at manufacturing aircraft engines....prone to explode on taking off.
4. Poor seamanship as a Chinese destroyer was out maneuvered by a Philippine coast guard cutter and collided with another Chinese vessel loosing a bow section.
5...Poor quality steel and poor quality welds...resulting in leaky hulls and guns disabled as turret welds crack.