Is there something wonky with the MMR?

Playing out of my placements and the first few games and it seems like half the players should be in plat with their mechanics and the other half should be lower than silver. Making the games really coin flippy because of how wide the skill diversity has been. Just had a game Where the enemy had a godly velkoz and shaco but also a darius who was subtly inting. While my team had a decent shyvana but the ADC kept literally throwing away leads(Walked out of a winning lane and sat in the jg for 2 minutes giving up lead,not last hitting the enemy making me get all the kills etc). This isn't an expection. So far every placement match and the few games I played afterwards has felt like this. Hopefully this fix itself since at the moment I don't even want to risk playing and get dealt a bad hand.
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