Why would it matter if you are doing bad, you are doing bad, you can easily put a dot in front of your name before 7 or so minutes are up and you realize you cant rate that map due to a bad start, if you just unlock at the end of the map, you will lose rate if you decide to play for fun, and then you see yourself getting lots of hs, and kills, don't mean you are getting alot of xp per minute, and that will result in a minus. because 1: you didn't play for rate at the start, you lost lots of chances for xp per minute, and 2: others who are actually playing serious from the start of the map will have way more ppm than you, and then when you unlock at mid map or end of the map, you will lose it, so this method you are saying is stupid unless your @ 10+ or 9+ rate. with a high rate beginning to end counts, so when you play for rate, you are playing it.