I'm not writing this because it can help with pugging, though it does. Raider.io score is pretty much the only reward you get from M+ currently, and certain weeks you pretty much need to run non stop to increase you score and other weeks you basically take the week off. I think raider.io could start grading more on a curve, giving more points to lower keys on harder weeks and less points to higher keys on easier weeks, based on the success rate.