SZ37 is good move in terms of making a dent in Japans navy and it is a huge loss for them. However its only really worth anything if Japan needs to replace the units, meaning unless you are going KJF its a completely pointless move. And it is a really, really boring move as it losses the game for the allies if it fails…
You cant really base your opinion based on Hard AI on triple A as its not really any good. The Hard AI Japan for instance tends to buy 10+ transports and do all types of unfocused ADHD moves all around the pacific without any clear objective, they take mexico, they take alaska etc…