Based on those pictures, the construction noise you heard, having slide and waterfall not working, etc. that sure seems like more than a minor here's-a-pin inconvenience.
From what I've read in other posts from people who stayed in late 2012, it sure seems like the expansion disruptions are worse now than they were then. And considering that guests were given credits/refunds during that time, it seems to me those staying in Jan/Feb should for sure be getting more than a pin. Credits seem very appropriate to me.
Unless I'm wrong, when some guests were given credits that huge "grafiti" wall was not in place and the huge construction vehicles were not parked in front of the grand villas. I agree that they should have spaced the expansion out over different times.
This just really isn't fair to visitors considering that Hawaii obviously is a much more expensive flight for most than a trip to WDW or DL, Aulani is all you got for Disney on the island so it isn't like WDW where you can head to other pools/resorts to get away from the construction, the points per night are much higher than what it costs at other DVC resorts so you are spending more, not to mention the fact that for many guests this is a once in a lifetime trip.
We are heading to Aulani this month and I must say I am very disappointed in how Disney has been handling the construction. Sure seems like they should have thought through the building of the resort better so that a huge expansion like this was not needed a mere 1.5 years after the grand opening.
We have been planning this trip in our minds ever since DVC first reported that Aulani was happening. We purposely waited to take the trip until 1.5 years had passed from opening because we thought that would assure any kinks of the resort would be worked out by then. We had no idea when we booked that this expansion would be happening.
I hope you were still able to thoroughly enjoy your trip and I hope our trip isn't totally dampened by the loud noises and unsightly construction views.