Any team in a ranked game has 1 to 4 (depending on the rating) players with one purpose: being a tanky healthbar on a node and spamming aoe. They have no mechanical skills, they have no knowledge of the meta and don't know how to rotate. They just run in a straight line to a random node and faceroll their keyboard on that node.
The worst thing about this: these people are very often the deciding factor in the game. These players end up with some average gold rating regardless of any skill or knowledge. Because of the low population, these players will also show up in high rated games. If they tank a capped node, they can sometimes add a lot of value to your team. This is certainly the case if one of the enemy tanky players decides to 1v1 that. A tanky player 1v1ing on an enemy capped node, suddenly has no value and becomes almost uncarryable.
Every team in ranked has this type of braindead players and the completely random interactions between them almost always decide the outcome of the game.