WTF IS THIS BS?

Going 7/3 in my placement matches, played fucking well got matched with complete fucking retards on my team and like 2 games that I was matched with retards I was able to help carry the team but holy fucking shit, I'm in S4? Really wtf is this bull fucking crap? What's even the point of placement matches if you do better than last season and still get placed fucking lower than last season? Like my last match I had some god damn retards I dont even understand, it's like they think LoL is rocket science and always go balls deep.