Its too much to ask someone to review an entire website. I'd like to be able to submit one or more URLs to have just that page rated on style/usability.
It could be a separate kind of review, a kind of 'one-shot' review, of a very specific page. People adding websites could have the option to elect a specific page (or pages) eligible for one-shot reviewing. And then in preferences, reviewers could prefer to do one-shots.