So Riot, which is it that doesn't work... matchmaking or rank representation?

Can somebody tell me? Either the matchmaking system doesn't work (as in: it doesn't create evenly matched teams), OR the actual rank means nothing... so which is it? Why am I asking? Because every game, I get a random mix of folks, usually 8 x Silver II - I, and 2 x Gold II... and BOTH of the Gold II are on one team... why is that? Did your engineers maybe confuse some formulas?
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