F**k this rank placement like wtf 550 solo Q games silver tier but 9/13 Flex gets Platinum 2 tier?

You know what makes me toxic? Sh*t match making like this B.S I had a Annie who was mid and feeding which I wonder why since he never exhaust his enemy or follow them heck he doesn't even ward until i Bitched at him to him to ward. I check his account history and guess what the F**K i found because it's quite funny?

For some reason the Annie is Silver 2 with over 550 games 46% win rate in solo Q but has a 9 win 13 lost 41% win rate and is PLATINUM 2. I'm quite fine with him being in silver 2 but how in living HELL did this dude some how in under 25 games with a bad ADC history was allowed to be Plat 2 as a start off point.

Lets do the calculation of this system so we all understand what is wrong here. You need 10 games for placement which he clearly did and most of the time on fresh off the boat account the max they will probably give you is Plat 5 unless they have your past MMR history which isn't the case here Flex Q. Your telling me with 9 wins (Not 10 since we carried him) and this is just a example since we don't know if he actually went 9/1 in placement was some how able to get platinum 2 or even Platinum 1? Since he lost over 13 games so it means he must had got demoted from platinum 1 or never actually went 9/1 in placement?

Fix your pathetic system Riot because this is pathetic match making/rank placement ,I was about to rage at him since he was screwing up non stop but held it in. What I realize after game is it wasn't his fault it was actually RIOT GAMES fault for placing him in Platinum 2 with a 9/13 41% win rate ratio.