You don't need 2 of each, you really don't. It is more people going berserk at the start of the game and crying to no end if it doesn't happen that throws the game off.
Now as for why to play competitive, QM is simply too terrible to even consider playing. And if you play good enough you'll win most of your games, if you notice you get one bad game after the other just stop for a while and do something else instead of constantly hitting your head against that wall.