I thought that you took a very interesting angle in comparing G.I. Joe to Ken. It worked out very well. I also liked the point that you made about Ken needing someone and being marketed just as an accessory to Barbie. The side-by-side images were also helpful in supporting your thesis.
Although I think you did a great job, parts of your post seemed a little too repetitive when it came to making your point. I also thought that since you are quoting Messner in terms of his study, it might have been a good idea to give a brief one sentence summary of what his study was about. The reader of your blog may not be familiar with this study.