New ranking system is full of frustration

Agreed. Maybe the dev team feel that for S12 the Rank is boosted for too much that many players are Diamond now. However the new RP system makes sense to some extent, trying to create more challenges for players and eventually those who are not really at that skill level will drop down, eventually. However the bad match-making system just ruins the effort.

I was reaching Diamond IV in S12 2nd half, career best for me, given that I only play ~150 games per each season. And this season I got started from Silver II. I'm a general player who doesn't have a fixed 3-man-team, I only solo-queue everyday after work hoping to get some fun. And match-making me with some Rookie IV or Bronze IV teammates totally doesn't make sense. There's 1 game that I have get 5/0/5 with 1000+ dmg and then I died because of the ring. And I was then watching my Rookie IV teammate playing. He got 54 dmg, with 5 kill participations. You can imagine the frustration I have. And to add on, now the game doesn't value early game kills at all. 

I know I may not be good enough for Diamond rank, but at least I deserve some better rank, or at least I deserve some teammates that match my skill level, definitely not some Rookie players. I am not trying to blame them, it's not their fault getting paired with me in my team. I can clearly tell their game experience is also terrible as they don't understand what we are doing and the pace of the combat is way beyond their control. What needs to be addressed is literally the poor match-making system. I sometimes match-up with 2 other Silver II teammates who both have the Diamond parachute effect, and sometimes I just got random Rookie and Gold teammates. This is the biggest problem the game has, in my opinion.