Howling Abyss - sensible random picks

I play a lot of ARAMS for a quick fun game, but many times you know you've lost at load screen because you have 4 melee champs and no tank, and they have a tank, 2 adcs and 2 mages. It isn't fun when you're going to get crushed pretty much no matter what. My suggestion -

Each team gets randomly assigned 1 tank, 1 melee fighter or assassin, 1 support and 2 ranged champs (mage or adc). Allow players to trade roles but not to re-roll in to new rolls, so the assortment stays the same. It would still have random champ picks, but with much, much fairer games that would be more challenging. Anyone feel the same?