Writing has never been Borderlands strong suit, and I don't expect it to get any better. The story will be bad, the dialogue will be bad, the jokes will be bad. They hit gold once with Borderlands 2, and never again. Will the gameplay be good? That's the real question.
Borderlands 2 had an excellent antag with some pretty good writing. With Borderlands 3, the antags were so insufferable, with the rest of the characters only progressing the plot because of stupid decisions, that I really didn't feel the need to continue.
Toilet humor is the fucking sauce of Borderlands. BL3's greatest flaws were the insufferable antagonists, the annoying Chosen One kid, and the death of my favorite player character directly caused by her. They might as well put skibidi toilet in BL4 because BL3 had the same kind of contemporary brainrot.
The toilet humor wasn't the issue. It was the NPC's never ending stream of sarcastic and self referential monologuing involved with every single step of every quest. There was rarely a moment of silence where I could just focus on the gameplay.
Vermintide and Left 4 Dead's rolling commentary works because they use it strategically rather than filling every moment of time up with bullshit. Borderlands just got worse with each game until the third one went off the rails.