Sorry, I missed the fact you were speaking in regards to games with 0 reviews. The weighted rating as the name implies bases on the ratings of threads (i.e reviews), when there's no reviews on a thread, the filter will output the same score for each thread, which is 0. As such it won't prioritize any thread over the other. If you reach the 0 review part of the sorting the filter is useless, so I'd reckon it's working fine, but I'll pass it on before stating anything else.