Also, I suspect that some of the comments here are either fake or staged. However, I'll give them the benefit of the doubt. If my skepticism and critique here are based on misunderstandings, I apologize.
You answered your own question: this is kind of different because it is not a greasemonkey script and thus targeted at a different audience.
edit: looks like there is a v0.1.2 coming which is much smaller 404.3 KB https://addons.mozilla.org/en-us/firefox/addon/netflix-rate/...
It would be great if you can add the IMDb rating at bottom right corner of the title image, instead of me having to hover on title to see. It kind of gets annoying to check each and every title for ratings.