Creating ways for multiple players to win in one given match seems like it could be a way to balance out this issue. For example my team winning, top scoring, having the highest number of kills, the highest KD, scoring the most meta-XP or completing an achievement could all be different win conditions for different players. For example in Team Fortress 2 my team could lose and I could be bottom of the scoreboard and still feel like I won after getting a couple market gardener kills.