I used to play on the NA server, I've got around 900 wins on that.
I moved over to the EUW server a few months ago,
I've got ~330 wins and 240 losses right now.
Because I've got the experience of the NA server taken to the EUW server,
I'm pretty good for my amount of wins on the EUW server.
In normals, I used to get matched up with mostly Gold, some Platinum, and sometimes even Diamond players. (On the EU server.)
Now with the new matchmaking, I get matched up with some silver players, and rarely gold.
Most of the players are way below my skill level.
Although I know skill level is taken into account with the matchmaking, I think it's not enough.
I've seen obvious difference in skill when I look at my teammates pre- 16th, and post- 16th.
I hope you take this feedback seriously, and I hope there are a lot more people that complain about this.
When I keep getting frustrated, I might play the game less because of the negative experience.
Also, keep in mind that, when I get frustrated by those players, there is a good possibility that I'm a toxic player in one of the games I play.
EDIT: Please bring back the old matchmaking. It was perfect, I came matched up with good players, it was challenging, balanced.
Now, it's like playing with bad people for me, either my team wins early game and snowballs, or the other team wins early game and snowballs.
It used to be fair, most of the time only small advantages in the laning phase, close games, dragon/baron fights deciding the winning team most of the time.
Most of my normal games used to look like games you see on high elo stream, just less skill, but in general it looked the same.
When I play now, it look likes you join ranked for the first time, 1200 elo people that don't understand the game, and only bash and flame to each other.
When the old matchmaking will be brought back the game will be so much more fun for me. I'm really sad. riotpls