I understand you, I feel you and I fully support you.
Getting into the game can be bit confusing, people are searching some random locations (usually dying there), they are picking something to reduce your max HP even if you dont want to because you are not good enough to survive with low health pool.
Ranged spammer everywhere just hogging all kills, while they are not watching flanks or other people backs.
All that is true. And its kinda sad . But thats simply community, in every game you will find people you want to strangle over the internet and sometimes you find people you want to marry.
I myself from time to time run some recruit missions, talk to people, show them some tricks or where tomes/grims are.
But what exactly do you expect from the game? Always when you have problem with something drop in idea or thought how the thing could improve.
Lets not talk about skilled people. I consider myself good, but sometimes when I run legendaries with my friends I feel like I am just slowing them down , even though I am not dying or anything and I do all stuff they ask. Simply good people are here for the win, so its obvious when you hit some farmers they are just rushing to get tomes/grims and finish the game.
But when you are in normal game what do you expect from it? Even new people will learn where the tomes and grims are, free XP is great thing and it doesnt even hurt (tomes are easy to collect), you get better loot (its always nice to get some orange stuff).
There is no reason to tarry, you dont get more XP for more kills, so someone doing all the kills and damage, well who cares. You dont get more XP for more time spend in the mission, you dont get more rewards for killing more bosses.
Aside from tomes/grims there is nothing to explore, no lore pages, treasure chests are usually along the way, same goes for pack rats.
What sort of coop do you expect from game thats basically
Mario Skaven Kart .
Well if you meant people not hugging chokepoints or reviving you, thats different problem.