please a game like this cannot be abandoned like this. the scoring system is a joke. you win 10 games and give you one point per game, you lose one and you lose 30 points. please 343 fix things.
The issue isn’t with the scoring system, it’s related to the rank of players you face against. Quick response s that you get more CSR for beating players that are a higher level than you and less for beating lower level players. On the other side you lose more CSR for being beaten by lower level players and less CSR by being beaten by higher level players.
If you have concerns about any of your recent matches, feel free to get some links to them and post them in the Matchmaking feedback thread that is pinned at the top of the Matchmaking forums. Dr. Menke should be able to look through those matches and explain what was happening at that time.