Glad you approve, do it. I also mald a lot when there are incompetent teammates, one of the reasons why i basically only play 5 stacks anymore. But from my experience it wasnt nationality based. There are just more players playing solo or duo from eastern countries than western, at least in my games. So it only seems like they are the problem but its the same for every country, everywhere the same idiots and same nice guys. Dont expect to get nice teammates when u soloq, expect horrible toxic shits and get surprised when you actually get nice teammates for once.
My experience comes from faceit, not from MM, i play like 1 mm game max per month