Since Tera was brought out and I have played it for quite sometime, I can say those 3 dungeons mention is really about teamwork and not personal score. Without proper teamwork it's impossible to complete them, except for Temple of Temerity which is very easy when you are geared. It would be interesting to see something like this where the goal is to score highest against other team in the server, and also the chances to get some rare loots.