Two recent commentaries via the Lowy Institute. First a paper that starts with:
In this Analysis Lowy Institute Melanesia Program Director, Jenny Hayward-Jones, argues that Australia’s massive expenditure of $2.6 billion on the Regional Assistance Mission to Solomon Islands (RAMSI) was a high price to pay for restoring stability in a small country. She argues that although there were many laudable achievements, the key lesson of RAMSI for Australia is the importance of knowing how much to spend and when to leave.
Link:http://www.lowyinstitute.org/publications/lessons-ramsi

Without a full reading I noted this mission had a large policing component, with the military role in the background after the initial intervention.

A counterpoint argues that:
We argue that these claims need to be tested against global experience and Solomon Islands' social and economic realities.
Link:http://www.lowyinterpreter.org/post/...-worth-it.aspx