I don't know who these guys are but you just have no sense what you said nearly every DCEU movie have them saving saving ppl right from start to the finish and that's what drives our caring of them because if not what's the whole point spitting jokes, review your words bro
Personally I don't care about any of them. Because Flash is new. And Aquabro too. I don't know them, I cannot care about them. The origin stories are missing.
Batman saved like Martha because shes Martha, other than that he came of as an old grumpy dude on a killing spree. I don't know why so I cannot care about him being grumpy because we saw a costume for 2 seconds that had "hahaha jokes on you" written on it. And if you have to explain to me now why I should care, or if I have to research why Batman acts like that and why I should care, then the movie didn't really do a good job at making me care.
The difference between DCEU and Marvel is that DC is basically the reverse-flash of the cinematic universes. They do all backwards. There is no real introduction to Batman, or Steppenwolf, no build up to the super villain through multiple movies except for a few seconds in BvS. They are Marvel-on-steroids and try and go through the emotions in 1/10th of what it took marvel and do the necessary character building later.
It's like you want to bake the same cake like your competitor but in less time so you crank up the oven, but what you get is a burned cake.
The only character I can care about is Superman because he had his origin movie, but the character is totally botched even though Cavill, if given the chance by a good director, could totally nail it.