As to the NH-90: I am sad to see it go from a neat idea (ah, the halcyon days of the 1990's) to 'having a few problems along the way' but if there are 500 of them up and flying, still, I'd say it's a successful model that, like any helicopter, has its quirks.
But it would seem very few of those 500 are actually available to fly at any one time and spend far more time in the hangar than in the air