I find its really hard to tell. If I look at completions of raids it could be inaccurate. Take for instance mine, it says I've only killed Atheon 4 times. I've done that in less than an hour before. Same with Crota. It doesn't say this guy can run this alone. My grimmore is really high at least to me, mostly I go by trial and if they are good I friend them if not I don't. If they can't handle the most basic of things in a raid or are unable to follow simple directions I kick them. When playing PoE I will try to finish until it looks pointless then I politely day that I have tried enough times and can not continue. Thank everyone for trying then move on.