When I make my groups for the weekly 10 I don't actually look for people that are good, I mean I don't invite complete low ilvl dudes, but to me the most important thing when inviting someone is knowing whether he/she leaves the run or not. I can deal with a 1 hour run as long as I get my M10 done. So in that regard R.IO is pretty pointless for me. In fact, the higher the score the more likely it seems to be associated with the probability to leave the group after a wipe. I wish we would have an addon that shows who leaves how often. I would only invite people that leave less than 10% of the time.