Teemo Support

I try not to blame my team but when game A you have TF, Morg, Annie, LS and Sivir team you start to wonder if you're getting f'd with. Then when game B you get a Teemo support who goes 2--7 you wonder what you did to piss Riot off. Is Teemo support a meta (viable pick), a troll pick or something you should report someone for. Should roles be locked in Ranked? E.g. if you get bot you can only pick Marksman champions or if you get mid you can only get mid lane champions.
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