Starcraft is a single player game , with mmr decay or not if you havent played the game for a while you will not be at the same skill level . You can go competitive without any SC Quick matches at your own loss and you acknowledge that , it ' s only you to lose . Here ' s the thing now , in heroes you play with another 9 players . You are ruining the experience of at least 4 people when you join a competitive game . I had this guy last December playing Zeratul , dying in solo lanes and generally walking around the map exploringsightseeing . somehow late game we were lucky and managed to get the upper hand even though it was level 22 and he was still solo laning . I was tempted to check his profile on hotslogs trying to understand why the matchmaker would put someone like that in my game . I was shocked to see that this guy is 3500 MMR . I politely asked him if he is trolling , he expressed his regret and stated that hadn ' t played for 5 months . There should be an MMR decay at least after 4 weeks but up to one point . Maximum one league every season .