How did this even happen? (Flex Queue Experience.)

Alright, let me preface this by saying that I admit to have been extremely angry during this experience. I roasted my team harshly and for that I probably owe them an apology. On to the event. We get into champ select and the first thing I read is "This is my first game". Soraka support. Takes exhaust and heal. Doesn't know which lane to go to. I get no leash as Zac jungle. Our Mastery 7 Zed feeds Anivia. Our Heimerdinger dies twice to Udyr top pre-10 minutes. I'm honestly just sitting here questioning, how the heck does Flex Queue work?! This is ranked. How do I get placed with people like this?
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