I did not have a problem following the story on my first viewing.
It’s not got anything to do with explaining anything in terms of the story. I was simply trying to find an anchor for the characters names. If you walk away from a film not knowing any of the characters names after watching it that is always a bad sign and because they don’t really speak to each other either then they never really establish the characters names well enough fake or real.
After the driving the truck test when the Guardia comes out and calls their names as chosen. There are no subtitles and he has a thick Spanish acent. Then when the Hitman bloke kills one of the chosen crew to drive the trucks. He is never named throughout the whole film I don’t think. He is just there and speaks about 3 times.
Perhaps that was the moment to really cement at least 3 of the characters via subtitles?
If you can’t accept it has got some serious faults but it also has good things about it also then I don’t know really.
Even though these characters are undesirables, we are meant to slightly grow to care about them… But only a little.