I recall playing this and after the 3rd session chucking it in as the marine players were having no fun at all. Thrir aircraft were extremely ineffective and they ground forwards just getting shot to shīt . If one side is having no fun, we'llchuck it and start again.
The napalm attacks are, IMHO, the most likely to cause substantial results. While the actual attack might even not be that effective (e.g. a hit against a pillbox using the Area Target Type will use the NCA pillbox TEM on the effects DR), the Smoke from the napalm blaze & the random SW destruction when the napalm blaze ends can be the most effective parts of the attack. Depending on what you target, maybe 1-2 regular bomb attacks will actually hit. It's possible you won't hit effectively with any.
The American player has a 99 point CVP cap, and I believe that is how most games will be won by the Japanese. Given that, the American player has to be prepared to be target for a lot of fire. The scenario is also in the "early" style: there is a long development before there's any face-to-face, smash-mouth action, and with some luck for the Japanese it may not even get that far. Then too there are some opportunities for bad strategies that decide the game. I think withholding fire because of concern about the FBs would be one such strategy, but as I have never seen that tried, it is only my opinion.
Because it is a large scenario to set up, especially for the Japanese, I think it requires some preparation that goes beyond just setting up. It may even require playing once to get a feel for the scenario. For these reasons players may be disappointed with how their game went. I think it is probably a good scenario but I also think it requires a lot of effort to get a satisfying result.
JR