Rank Game Play and Matchmaking Question

I am confused on how this matchmaking system works. anyone know how you are queued up

with 4 random players? The reason I ask is because I have climbed up the bronze ladder to

only be knocked all the way back down it faster then I seen it happen. It was like hitting a brick

wall with trolls and afk out of nowhere. Sense then I win one loose 2 win 2 loose 1. I read

today that it is based off of your skills and knowledge of the game. That would make sense.

You don't want someone climbing up the ladder dumber then a box of rocks. make s the

game look effortless. But I know the game well enough and I know my champions very well

that I trust my pick in selection to be able to win. I seldom loose a tower and I may die but it

game isn't me. I cant control the other 4 people and how they play. Bottom always falls and I

tell the truth the last few days they have lost towers and combine for 20 plus deaths in 10

minutes maybe 15 if I get lucky. Then they go to another lane and by 13-16 minute mark game

is done or we lost and I cant grasp what is going on. I always tell them to gl hf and play safe

and smart. But I get what I call bttm feeders. afk, trolls who would rather feed and give the

other team kills then try to win. I don't understand the system or the logic behind it. So if

anyone knows Can you please help me understand? I do like this game and I have seen it

come a huge way in the years. But this season is horrible. I cant find a mode I like better then

rank. Aram is ok but champ selection isn't suiting me. Dom is gone and Twisted is ok but only

for kicks. Playing summoners rift in any other mode is even worse then rank. So I don't know

what to do. They say teaming up will get you out of bronze but my schedule is different most

times and the people I use to play with are gone, they don't play league anymore. So what do I

do? I will continue to play it and if there is a method that's holding me back besides my actual

playing ability then B5-0 I can make it happen real easy. But I like to have that fair shot and I

don't see it and it isn't there. Real quick, I get players a lot more now that ask me what champ

plays mid? What items do I buy? What sequence do I lvl the up at? Are you serious. I don't

need this. I need players who know the game and know what to do. This isn't about most kills

or who got there lane faster it is a 5 person team game and that isn't there. It is gone. And by

the way I do help the ones that need help. Anyways Anyone have a simple break down on this?

Thank you.