What would you look for in a site that rated commercials/ads. What would make you go there and keep going?

What would you look for in a site that rated commercials/ads. What would make you go there and keep going? I was thinking about starting a web page that features commercials in an easy functional way where they could be rated, commented on, and judged. What would you look for in a site like this. One suggestion was write the names of the songs used in the specific commercial. Other ideas like this would be appreciated.