But a lot of their ships will be junk.
I will admit, most of the ships of the PLAN are actually pretty good.
However, the doctrine of the PLAN is a complete joke. And as such, the quality of the ships really does not matter at all.
As an example, think of it as the way the German Navy used their capitol ships in WWII. In essence, they used them horribly and were trying to operate their ships as if it was the middle to late 19th century. In their most famous sortie, they sent out the "Pride of the German Navy" with a single Cruiser, and a handful of cargo vessels. Yes, the Bismarck did indeed sink the Hood and damaged the Prince of Wales, but all should know exactly what happened next.
The two capitol ships were hopelessly outmaneuvered by the highly experienced British Navy, and the two ships had to separate. The bunkers of the Prinz Eugen were almost empty as were her magazines, and she withdrew from the action leaving the Bismarck alone. Finally near the coast of France it met up with a Destroyer escort and retreated to port in Brest as the Pride of the German Navy was soon turned into an artificial reef.
And for the rest of the war, the German Navy was almost a complete and utter joke. The Prince Eugen was kept in port until constant damage from UK Bombing caused them to pull it up to Northern Germany. And the entire time there it was trying to fight of UK ships and fighters and was heavily damaged. And after a lengthy repair she spent the rest of the war in the Baltic, and had almost no impact or influence on the war.
The fact is, as much money as Germany sank into their Navy, it was never used effectively. Because they were trying to use outdated naval concepts that had not even worked in WWI. I mean hell, look no farther than the Admiral Graf Spee. Sent out largely on their own at the start of the war as a commerce raider, which to be honest is a wasteful use of a Heavy Cruiser. But she did well, sinking 9 commercial vessels in 4 months.
Then she got jumped by three British cruisers, was badly damaged and had to retreat. The Brits kept it bottled up at Montevideo in Uruguay, with not enough fuel or munitions to fight through them and with damage she could not repair. Realizing how hopeless the situation was, the Captain ordered his own ship scuttled.
Those were just a few examples of the German Navy in WWII, and China is at about the same state when it comes to Naval Operations. And to be completely honest, I would expect the results to be about the same as the Germans in WWII. Do some damage, but then go down gloriously to become reefs as they simply are not versed or experienced in actual fleet operations. And even if they threw together a dozen ships, they would not operate like a fleet like the US, Japan, UK, or most other navies of the world operate. They will operate like a dozen ships simply thrown together.