The first woman in the role. The daughter of a U.S. president. In some ways, Caroline Kennedy was a unique U.S. ambassador to Japan.

The daughter of the late President John F. Kennedy was so popular at the start of her stint that thousands of spectators flocked to see her when she presented her credentials to Emperor Akihito at the Imperial Palace in November 2013.

But despite her popularity, critics say Kennedy will leave behind a mixed legacy when she finishes her assignment Wednesday. While she played a great role as a goodwill ambassador, critics say she showed relatively little interest in policy issues and lacked the experience needed to lead and manage a high-profile institution like the U.S. mission to Japan.