David Nicholson left his posting over the weekend after almost two years in Apia.
He told the Samoa Observer a lot of aid projects failed because officials in Wellington do not understand the local context in the Pacific.
"When people talk about the Pacific in Wellington, they use a generic noun and as you know, you go to different Pacific countries and they are all very different," he said.
He said the aid process is full of process and takes too long to be implemented, although it has a focus on quality.