Please just remove 4-man premades from ranked
I've played as a 4-man premade before and it was not fun. Since we were on teamspeak we neglected to talk in chat with the solo player, and the game felt completely desynchronized. I know I wouldn't enjoy it from the perspective of the solo player either, even though it's not happened to me in ranked.
I don't enjoy 4-man premades regardless of which side I'm on, and I'll never play as a 4-man premade in ranked again. It just doesn't feel like League should be played that way, ever.