This is a frustrating this to have to deal with I know. Lately all I've been getting are players of a very very low levels, and in your situation (for now) just try to raise your MMR to a higher threshold where the more experienced players lye. That's just one recommendation.
If you feel like you shouldn't have to ,then continue making your voice heard, its not falling on deaf ears. In the mean time keep using the team commands as needed even if you get no immediate response from them (or none at all).
You can't help everyone but by helping one Raider in need when they cross your path will help set an unspoken example.
I'm not asking you to spread your self too thin or stress yourself out looking over your shoulder to babysit, there going to die. But no one ever got good at something by never failing.
Just be patient and you'll get the in-game rewards your looking for and at the same time you'll make new friends.
im level 54, 55% MMR. the higher my MMR goes, the worse the mentor matches get. New players are having fun with the game for the most part, they dont care for what team mates are pinging heck they dont even understand the ping system. So far i havent made a single friend. you know why? coz i cant talk to anyone, hard to make friends when everyones a mute. tried spaceguilds but nope not even successful there. i joined the community discord, posted several times over several days and not one single person has wanted to group up, i kept an eye on it, seems to be same people over and over grouping with the same people. what even is the point.
Another point, how do you not get stressed? 3 mins into most games either they've left or its you on your onesome wiht a 120 sec survival, only to surpass that into a 6-7 mins mark of another 120 sec survival, the problem with these games is although they can be beat, it takes the upmost patience for absolutely no rewards, 20% for a team that have 0 idea how to play, is no where near good enough, i just want the option to get out of it. its bad enough that when the rewards changed to 12 hour resets i lost half of the rewards there was before that, now its an actual chore to grind gold and thats without the mentor games. with them, i get 1-2 mentor games in and i'm done for the day, at this rate maybe the week.
its getting to me too much these days, i've started playing less and less already, the desertions are just becoming too much.