Matchmaking is rigged.

Alright, I'm about to go full rant mode here. My friends play in a group of 3 or 4 usually. What they do makes me so angry, and it should be counted as cheating. One of the people takes their primary role, and then puts jungle as secondary. Someone else puts jungle as their primary, and then the other person's primary. They are guaranteed to get their role, and it pisses me off so much. One, because someone we get paired with is probably cheated out of their primary. Two, they're not improving at the game, just their role. I just had an argument with one of the perpetrators, to which they responded that mastering one role is better than being good at all. They completely disregarded my side of the argument (saying the opposite). I feel that Riot should fix this, as it still lets us queue up, which I think is utter bullshit.

TL;DR- Cheating to get your primary 100% is bullshit and should be fixed.