Whilst I understand that you were mad about the situation there are certain things which are just unfortunate and I am sure NH did the best they could in that situation.
They probably did not know that the engine could not be fixed and therefore asked the pax to stay on board as it might have been fixed very fast. That the aircon was not on is something bad though I agree.
However they did send you to a hotel which probably a US based airline would not have done and often airlines do not have a spare aircraft lying around and there needs to be some time to prepare it before it can be dispatched to the location. Also probably at the beginning it looked like the plane could be fixed and therefore the replacement plane was not sent earlier.
The compensation may not seem much but that is why you have travel insurance and the airline is not obliged to give more. Maybe if you send an e-mail to them they might give you some form of compensation (i.e. if you could not stay in your hotel in Tokyo for the first night they might pay for that one night).

At the end of the day we should all be glad that airlines take maintenance seriously as you don't want to find out about a problem between HNL and HND where there is not much land around to divert.