At Kerboo we have two metrics, LinkRisk and LinkValue. LinkRisk is designed to show the risk any link could pose and LinkValue is designed to show the true value any given link may pass to your site. We used to be able to rely on metrics to score the value of a link but Google has made the value of a link increasingly opaque. Link metrics are generally an approximation of the theoretical PageRank a link could pass (with some tweaks etc) but this way of working doesn’t give a true picture any more. So many of the links we have are now being ignored by Google or discounted and LinkValue is the only metric available that can solve that problem.
LinkValue runs from 0-5 with 0 being no value at all, 1 being a small or debateable value and then 2-5 showing increasing levels of value that the link may pass.