Frankly, as I've said before, I thought the whole event has been handled very well. There will undoubtedly be review and analysis of what could have been done better, and of course with 20/20 hindsight there will undoubtedly be room for improvement.
However that does not change the fact that a response to an unforeseen event - the possibility of a major volcanic ash cloud disrupting the worlds busiest intercontinental air routes, has been handled very quickly, considering the coordination required, with minimal disruption to the travelling public.
Well done to the industry as a whole! You are in a better armed state to face the next challenge when it arrives.