Mumbling in Movies and other oddities.

I'm not sure if it's only me, I did a quick google search on this and it seems it is an issue, because I never got random unrelated results.
Inaudible or mumbling dialogue, I'm good with accents and can usually decipher exotic dialects (in English), without a problem, whether it be the sultry southern drawl of the USA or the caveman grunts from Manchester.
What's going on with the films and TV shows now from the good ol' US of A? They're mumbling lines and don't do a retake, I think I need subtitles sometimes. Honestly this isn't about not understanding accents, it's about mumbling lines like a lazy f**ker or loud music overpowering subtle lines trying to be delivered.
It's no biggie but why is this a thing?
Please tell me I'm not the only one.

Totally agree, I'm making my way through Sons of Anarchy at the moment and a lot of the dialogue is genuinely hard to decipher, thankfully the plots are so bloody telegraphed that its not that big an issue :-)

I couldn't understand a word matthew mcconaughey was saying in Interstellar.....

I have a real issue with confusing song lyrics for completely different words

Why has Tom Hardy started grunting so much?

He started doing it in Lawless, and it seems to have spread to his other films.
Like this weird nasal grunt.
Annoying.

Actors delivering lines while eating !!

!! I know exactly what you mean but I get it with a lot of British shows or English Accents. It's probably the accents. If you get it from American TV and I get it from English TV, I'm thinking it's just an accent issue. I have issues with the thick Scottish accent and Cockney.