As reported by PC Gamer, what players were experiencing was an exceptionally gnarly bug related to the bloom on weapons in Battlefield 6. The mechanic, which increases the spread of bullets and reduces player accuracy the longer they're firing, seemed to be affecting players regardless of how long they were firing and the range at which they were engaging with enemies.
The main issue seemed to be based on progression. Some of the weekly missions involving the M1 Garand, for instance, weren't tracking correctly in All Out Warfare. Some players also felt that the grind to unlock the free cosmetics was a bit much. This has led to a Tier Skip function--a feature that, depending on who you're talking to, presents its own set of issues--allowing players to pay to advance through the ranks.
As a game that's constantly evolving, Helldivers 2 is no stranger to hotfixes and patches. In fact, a new update has just gone live, and it is designed to quickly address several issues that have cropped up in the game since the start of the Into the Unjust event in the game. This new patch focuses primarily on game-breaking issues causing hard crashes, as well as buffs to the new gear introduced in the Dust Devils warbond.