There needs to be an absolute and relative filter. If there is only a relative filter, and a node has only 1 vote, negative, the node is filtered.

Instead, set a vote minimum, perhaps 10. If there are less than 10 votes, and the sum is -7, filter the node.

If there are more than 10 votes, then use a formula, like:

if (($count > 10) and
    ($sum / $count < -0.2)) {
    filter(node);
}
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