Fill/Autofill
Picking fill will 90% of the time land you with nothing but support if not already chosen. Same with being autofilled. Nothing is more pestering than loading up League of Legends, PICKING the two rolls i actually feel like playing, then being thrown under the bus supporting because it is the least picked roll among normal players. Seeing "Autofill Activated" under the two actual rolls one feels like playing is the worst feeling in the world. Queue times aren't long. 2 minutes at best unless you really get unlucky, i for one do not care about the time it takes to get into a game though, but after watching someone make a neat build for a specific champion, choosing the lane said champion is associated with, sitting in a 3 minute queue time and being autofilled support makes my blood boil. Not only is it annoying for the player who was autofilled, but for the team the player has too. Because it can lead to troll picking, dodging, maybe getting that one person who mains support but wanted to do something else for a change, or someone becoming so toxic it ruins the rest of the game. Worst experience a game can offer.