Hi Mihcael, I'm not sure why the star rating system isn't working for you, I have tried it in OWB on Aros and Opera and Firefox in Linux and it works for me. The stars don't show up in IBrowse unfortunately. The rating system is just a little image of some stars, and you click between one or five stars to rate it, similar to YouTube's rating system.
Perhaps the rating server was overloaded when you loaded the page earlier, or perhaps it's blocked, I'm not sure. I'm sorry I can't be much help