The only point I want to make is that playlocking is also unfair if you use it and feel a config that calculates such XP/Ratings is also when anyone can just look at previous map and who was there before and the avg. rate for that session. In any case a good rater shouldn't be "counting" XP but instead just counting their K/D ratio which is a good determinant of the xp they have earned including sprees etc..