Well here's what I think:
DDs should sink with 1.
CLs should sink with only 1 or 2 hits. Most sunk in the war were hit by only 1.
CAs should take 1-3.
CVs in the Pacific should take min 2. The Ark Royal sank from one, but it was smaller and less well protected than most CVs in Pacific.
BBs...well, it's tricky as it depends on age/class. Sink a Yamato with 6? Unlikely (if not impossible). Even Shinano took 4 (I think) and sank slowly, and that was with poor crew training and incomplete fit out. Most BBs hit by 2 would shrug them off with a reduction of speed and requiring some serious repairs, but wouldn't sink.
As for merchants, most of 5000t or less would take 1, and sink pretty quickly. Tankers will sink with 1 in the stern, as the engine spaces are the only reliable way of sinking a tanker with a single hit. In fact a single hit in the engine spaces should be enough to sink any merchant up to about 8000t, and most merchants weren't that big. I think torp damage - certainly stock - is way out of kilter, and even modded I think it still has issues.
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