The ratio of a person's kd in both pve and pvp is totally independent of their skill. A very bad player could easily boost their ratios if they so desired. By contrast a very good player may have a low kd ratio due to the fact that they always seek to fight top pvpers.

It's impossible to gauge skill by looking at a person's ratio or goals. To do that, you to monitor a person through many games and judge based on their most consistent performance.