ZS' version is not a mistake. The plots itself are great. Clark during his father died and refuse his son's help during tornado event just to make sure Clark really ready to put his own life to save others.

Saving someone with high speed actually similar with hitting people using high speed car. See part of the trailer where Superman fly with high speed to save Lois. Anyway, not arguing about that because all Superhero movies actually doesn't make sense.

Superman was my first superhero when i was a kid. For me, he's strong unlike this version. He didn't bleed easily, no cracked bones and always show that he's SUPER when wearing the suits. If this version want to show weak Superman just because want to show us that's how Superman should be, than, it should be just be Clark Kent instead of Superman. Even Batman can do better without Superpower.

Broly's Base Form = Goku's/Vegeta's Super Saiyan God

If he's using the higher form such as SS2 which was 2 level above base form, he might easily win the fusion of Goku and Vegeta either Vegito or Gogeta.

And i think, in the future, Broly might be the Trump Card for Goku or Vegeta if both of them can't win the battle even in fusion.