Cognitive bias. We remember the painful losses more than the easy wins. I felt that same way and checked my record - exactly 50% win ratio for the last 50 games, mostly IB. You have a 43% win rate for your last 50 games. It's not that bad, but we hang we feel the losses more than the wins, just like we remember getting dumped more than one-night stands. I will say there is HUGE disparity in game performance for me (a bad player) - out of 13 games yesterday, I had a low KD of 0.4 and a high of 12.0! They struggle game-to-game with balancing, but in the long run, it evens out.