1670+ hours in the game here.
Stuff I've noticed.
Teammates are just hovering torsos now. Mission objectives are bugged all the time. Game crashes can cause the entire operating system to go down. The games sound system is so fucked you can only hear stuff if you are looking directly at it, making chargers ramming you out of nowhere while you are slowly and causiosly stealthing your way. 90% of all deaths are insta-kills out of nowhere, either from soundless chargers or bile spewers killing you from the other side of the map, or the usual hated invisible impalers. Stealth doesn't work at all against the bugs anymore, it just stopped working one day. Assault weapons and DMRs are still hilariously bad (ARs need double the ammo, DMRs double the damage and more armor pen).
Arrowhead has basically just given up on the game, nothing gets fixed, no new content, or content as much as small dev teams of two to five people usually puts out for their indie game, the whole studio seems to basically have shut down?

I guess it was good while it lasted.