I hear you. Here's my day so far: 3 straight losses, despite coming into the day with a positive, can-do attitude.
Loss 1: Top lane feeds relentlessly, mid lane plays super passive and allows the enemy Zed to roam at will, thus causing our bot lane to get annihilated. Top laner continued griefing and ended up with 13 deaths. Bot laners were so underfed that they couldn't do anything. The enemy team just grouped up and took objectives at will, and ended the game.
Loss 2: Top laner died twice in the first 5 minutes and then left the game, didn't come back until 1 minute before the game ended. Enemy Diana smurf (60% win rate) mid laner popped off. The enemy team kept ambushing me to the point where I couldn't even farm my own jungle.
Loss 3: Enemy mid laner has a 68% win rate IN PLAT. https://na.op.gg/summoner/userName=ICantWaitToLose This is obviously a master or higher smurf, and please watch the replay if you don't believe me. She wrecked our whole team so completely and effortlessly it was hilarious. To make matters worse, Janna and Kalista bailed her out any time she was in a tight spot. This appeared to be a classic case of boosting.
So overall, I've lost 4 of my last 5 games despite getting an ACE on 3 of them on op.gg. The common refrain is always "people in your elo are apes, it's your fault for not solo carrying", but that's simply not true in this case, as the matchmaker is putting smurfs on the enemy team with disturbing frequency.