champion mastery
they need to make this apply to dominion and 3's as well. they are still matchmade games and you are still playing the champions of your choice. Maybe just a diminished return to make up for how short the games can be. because i dont play a lot of 5v5 i more do dominion and 3's because its quick and easy. then my champion masteries will be zero for when i do 5's? thats not right.