I have the opposite problem. I get a Zeus that want's to carry. A Rubik that demands the Jungler get the courier.
Theres always 2 people yelling about who gets mid. People trying Meepo without doing bots. People who will purposefully call missing, and randoms in captains mode that will blow off what the rest of the team wants or can do.
Then I get a 50/30/20% chance to get paired against a competent team/A Clan or Team/ An enemy team exactly the same. I generally get between 10 and 15 kills a game with 0-5 Deaths. But I am still in the lower tiers because of "carry zeus" Feeding, along with Huskars tanking towers early game, Spirit Breakers diving full hp targets under towers, like Abaddon and general stupidity.