A modern frigate with 8 Harpoons would sink any ship of any navy in WW2.
They can still sink any ship of any navy.
They lack the ability to penetrate battleship armor and only pack a 488lb warhead. But no ship today comes close to that kind of armor.
In any case, this LCS upgrade cannot survive a duel with a T-72 tank on the beach, or defend itself from the ubiquitous motorboat close in attack. It also has no ASW defense.
It’s a dog.
Its unlikely that Harpoons, with a 500 lb warhead, could have sunk a WWII capital ship. Many of these vessels took much worse hits from multiple equivalent weapons, many of which were even heavier armor-piercing shells, and underwater hits from torpedoes also.
Even destroyers are known to have survived multiple hits from equivalent weapons, such as kamikazes loaded with 500lb bombs or the like.
Granted the Harpoon warhead is higher tech than WWII weapons of similar weight, but it can’t be that much better.