Here's my take on the oddness of the first bit of the film, & it was definitely a bit odd. You have all these characters with incredible abilities that many would kill to have, but their lives absolutely suck.
Lois is an award winning writer, but gets her only joy by bringing a cop coffee every day at her boyfriend's memorial.
Barry isn't doing anything significant, just going from dead end job to dead end job.
Cyborg can't see past his circumstances & would rather pout, hide, & blame.
They all had some nice, yet very emo/depressing soundtrack choices for their intro.
Bruce & Diana are the only ones accomplishing anything worthwhile in their lives, & the music reflected that. Bruce just had the movie's opening music during his trek through Norway, & Diana actually had some action scene, exciting pieces.
As for Arthur, he's a good guy, but shallow, pardon the pun. He's fine with drinking & women to occupy him from his personal issues/depression. Here's how I think his adventures play out-
He does his good deed, hangs around to 'party' a bit & build the legend. He's more than ok with this low-level worship, & leaves his shirts behind whenever he leaves, like a basketball player giving his shoes away after a game. He even does it after rescuing the fisherman. If I recall at the beginning, it was mostly the village women, & definitely a younger, attractive one that grabbed his sweater while singing the chorus. He chided Bruce for, not figuring out his secret, but for interfering with the game he was running, & I think the way Bruce looked around when he left & everyone began singing is the way the audience was supposed to feel, "what the crap is this...?".
My personal feeling is the soundtrack was being used to show some internal feelings of the characters, to give the audience an idea of what was going on inside. To place the connection with the internal/external narrative.
