This is not WoW, if you want a gear score go play WoW.
Besides its completely useless, you que up and PvE with whoever is there.
And how do you score set pieces? They may not be of the same tier, and just because your purple ship shield has 1000 more points to it does not mean its better, I would give up a 1000 points on a shield for a set bonus any day.
Gear scores would be impossible and completely useless, they are an archaic thing of the past.