This is a series of essays written about a year ago dissecting Gunbuster and viewing it through a Japanese Imperialism lens. Knowledge of Gunbuster is not a prerequisite to understanding the content of the essays, but previous viewings of it as well as historical knowledge of Japan during the World War II period will help. (Note: I did not write any of these, nor contributed to any of them.)
Episode 2 (NSFW)
If you enjoy this form of analysis of any form of media, not just anime, the above pieces are definitely worth your time.