My god, I really didn't notice how bad the "win day lose day" is until someone mentioned it here.
Went from Silver 3 to Silver 1 in 2 days. Ever since then I've gotten ragers, feeders, ADC's starting with Magic Mantle and Warwick supports.
I'm not gonna say the last few days haven't tilted me in to a puddle on the ground and largely effected my play, but this is a little fucking ridiculous.
I always figured the system judged your skill and placed you with people based on your rank, not (He's won a lot of games with decent teammates recently so let's fuck that up with his MMR rating)