I'm implementing a feature for Sumea Game at the moment where anonymous visitors and sumea members will be able to rank the games on the site through Sumea comments. So when you post a comment, you'll be able to select a ranking value of 1 to 5 and it'll show up in your post. It'll also do some calculations after every post that has a rank selected and come up with an average score. There'll of course be some measures so people can't make multiple votes.
Adding this feature to other parts of the site that has Sumea comments would be easy to do, but it does beg the question whether this is beneficial or not. What do you think? Should we allow visitors / members to rank other members pics in their gallery?