My Squad and I noticed the same at 76%+ .

we play with people who just skyrockets the difficulty score with their levels (and levels adquired by buying things...it's unfair),

Just to be fair, player's levels don't raise up the difficulty of the missions, that's just an aestethic thing. People "skyrocket" the difficulty score because they win matches, so their ratio increases. Every time you win, you add 0.5% to your personal score, when you lose it decreases by 0.75% aproximately.
The thing is the playerbase is pretty small so we can't afford to have a strict matchmaking to even the games.
I personally know what playing high difficulty levels is, and its unfair to newer players, those games require to have a good setup of characters. Ultimately that happens in all online multiplayer games, there are times you can pick the characters you like the most, but at last, we all want to win and we know that we must pick the strongest characters for every map (and yes that involves not picking 2 snipers in close range maps).

I can at least admit that with the higher bump in players, it no longer takes nearly thirty minutes to find matches like it used to, which helps out with the higher gold rates. Unfortunately, for people like me who have small friends lists (since I only add people I know personally, or have played a ton with) the invitation system is basically useless. Everyone I know either doesn't want to play the game, played it and hated it since it was/is an unfair grind with crazy wait times with a clear incentive to try and force you to pay more real money,  or already owns both campaigns.

Just a note, Shiro, your argument is terrible. It might just be a peeve of mine, since I hate that argument IRL as well, but I feel that "New people shouldn't complain because older people had it worse" (people should always complain if they see a problem, even if the problem isn't as bad as it used to be) is meaningless, especially if the system is still bad.  And again, it's a coop game. Talking down about someone's time to beat a mission means nothing when it's all cooperative. You could be the best player in existence, but that doesn't mean a darn thing if the rest of your team doesn't know how to play. I've spent exorbitant amounts of times on missions because my team kept dying, and I stubbornly just ran around surviving until they were revived.

My argument can convince you or not, its just my point of view.
Then you are recieving an invitation system that allows you to rush characters pretty fast, but it is not of your convenience because you lack on friends to play.
So now imagine they just raise up the gold income enough for people who can't use invitations to get the new characters in less time. But of course, people still can get tons of gold by inviting other players .
What do they do with that amount of gold? it makes the game boring having all content (the free content of course) in less that 2 weeks. In that case some people would get bored about the game, not having more objectives and leave. We are again at the point were there are not enough players to find matches in a reasonably amount of time. If you dont want to use the gold income system they hand at you, then you shouldn't complain, i know people with more than 600k of gold, with already all the content unlocked, they are no unicorns, just people who have been earing it by playing.

The fact is that by "complaining", we got this system at least, and we have learned to use it so now the gold income is pretty good.
You can't change a whole game mechanic just because one player can't or doesn't want to use the invitation system, that's pretty selfish.
That's why i said new players shouldn't being complaining about something that is mostly fixed nowadays, it feels a bit disrespectful to the rest of the community who grinded hard for those items.

Now about the "i only find noobs in my games so i can't raise up my scores and get better rewards".
I started playing this game alone then, someday, another player who i was playing with added me in steam and we started playing together. After that, another one, some time later i got invited into a discord channel with a pretty great amount of players which i have been playing, improving and, the better part, getting fun. If you play alone because you don't want to play with unknown people its fine, but you are closing yourself to the chance of actually enjoying the game.

I just made 100K + of gold in one day, your argument is invalid, so are your maths ^^

I don't know why there isn't a report player option ingame, btw i'm posting this here. Today i was playing hanging from a thread and GAROU1vs1 (console player) started burning up lifes suiciding at the spawn zone. This has driven the team to a premature defeat due to we were 3 players against the IA and that guy was wasting all our lifes.

I was able to make a screen of one of his suicides, so i was wondering if you find this punishable. I think there should be an option to dump this kind of players from the game.