I feel ya. I am a decent player, and I am just starting ranked. I have been playing for about 6 months now and I know my role and how to fill it. I always win my lane or do my job right, but I am getting trolled by trolls or just dealing with unskilled players.
Just today, I had 2 TROLLS on my team. Two of them! They both invaded and got killed, then fed bottom lane. Not just a little. one went 1/21 and the other went 3/19 by the end of the game. I mean, why ruin ranked games for people? Ruin normals. It is like people don't care about their level 30 account, they just spend a month or so getting level 30, then get banned. That is a lot of time wasted just to ruin some games for some people.
My next game, it was like playing with level 15s or something. They were just getting stomped.
I have spent literally months playing normals just perfecting my own gameplay before entering ranked games. I guess I was expecting too much to expect the same.
Now I am retraining myself to jungle, because no one is ever worth a damn at jungling. At least, never on my teams. I think Riot has singled me out to be on as many troll teams or partner me with as many unskilled players as possible. Very sick of it.