As a Master's student, I have learned to and practiced analyzing things critically and objectively, especially considering the audience or venue that it is meant for. I am training to be a speech-language pathologist, meaning I am also able to judge how appropriate the content of your site will be for your intended market, by language, culture, and visual aspects. I can help you in the process of building your site for a specific audience or editing it to make it more sensitive or attractive to certain populations (e.g. the elderly, disabled, busy people, uneducated, etc.).
Also, I am blunt. I will be honest and objective (my BA is in chemistry, so you can be assured I have practice there, but my friends would tell you that I didn't even need the practice).