I have to agree with you chris,
I recently went to Phuket along the coast where they had the Tsunami, speaking to a taxi driver there we asked how much did the people actually see from the UK, his answer was "not a lot from anyone at all" he mentioned they had some food supplies but no evidence of the millions we/other countries pledged to them for rebuilding the area.
This comment disappointed me, ok my money went towards the flight fuel, cost of food supplies etc, but 90% of it was probably eaten up by "admin" costs, I think that dedicated disaster aid charities operation costs should be funded by the government, and majority if not all of the donations collected sent to these countries.
I will still be donating as every little bit helps but there should be a better way.