I've met people who did Peace Corps, and my opinion was much better after meeting them. First they actually became fluent in the local language. Second their focus was often more on enabling locals than on trying to do stuff themselves. For example, they would work with locals on how to push through applications for grant money from developed countries. Dealing with American foreign aid bureaucracy was actually a skill they were well suited for due to their background and education. Finally, they lived on almost no money in the community for a long period of time. The standard of their living was commensurate with the average person in the host community.