Well, I'll start off by cleaning up a quote from my dad...Opinions are like buttholes. Everybody has one, but that don't mean I want to hear from yours.
So here's mine...
Superman- More of what we saw in MoS. I didn't hate the film, but it didn't do anything to elevate the character. Nothing great, but I don't hate it, & I'll explain why i give it a pass in a bit.
Wonder Woman- WW was GREAT in battle, but I really can't see her carrying a solo film. Affleck isn't Lawrence Olivier, but to me, the Diana Prince/Bruce Wayne scenes just seemed awkward, & it wasn't his fault.
Batman- Here's where I differ from most, as I loved the portrayal of both BW & the Bat. It was definitely a departure from what we've seen before in a live-action film, but the reasoning behind it made sense to me.
First, we've never seen a Batman in this stage of his career. He's been doing this for over 20 years, he's suffered major loss since his time as Batman started & it's taken a huge toll on his psyche. The constant dreams/visions are evidence that he might be breaking. He's the last man standing in the war he's been waging, & that's made his decision making vulnerable, to the point someone like Luthor could manipulate him to the point he was. By the end, he's been renewed by seeing the sacrifice others were willing to make. It inspired him knowing that he's actually NOT alone in his crusade. He knows that there's something a LOT bigger coming as a threat, & he's going to be ready.
To address some of the issues others have pointed out-
The killing-You have BAD MEN attempting to do BAD THINGS. If in stopping them, they die, then so what? I go back to what Bale said in Batman Begins to Neeson, he didn't have to kill him, he just didn't have to save him. I'll admit, this has a bit of my personal feelings in it, too. You have a carload of teens that rob/carjack/kill/etc, then when being pursued by the police, they're in an accident, & some or all of them die. Here come the parents, social activists, & the professional outraged, declaring what a tragedy that these innocent young people died. They put themselves ina situation where there could be circumstances that would cause them harm.:confused
It was a departure, but not surprising,as I still don't see where he killed anyone.
The origin- I felt it fit, because it was part of the dream at the beginning. It was necessary to show the state of his mind, since although it has been 35-45 years ago, he's STILL haunted by it on a daily basis. It wasn't to tell it to us, it was to give us a glimpse in his head, & it's messed up.
Lastly, here's my take on the visions. I'm thinking Martian Manhunter. He's being held somewhere, & is trying to warn someone of the coming alien threat. That threat being Darkseid bringing Parademons & turning the Earth to another Apocalypse. He is able to reach Bruce, but Bruce's obsessions put Superman's face on the 'alien threat'.
The Flash vision sounded a lot like the Animated story from the 90's show, where Lois died, & Clark took it upon himself to declare himself the law.
My final thought is that the problems most people are having are because of DC's decision that every single iteration of their character is valid, because each iteration is separated by the Multiverse. This version of Batman is not the comic Batman. It's not the one from '66, from GOTHAM, from the Nolan films, from the Animated series, but they're ALL still BATMAN. It's just that EACH Batman is forged by the Universe he lives in. I showed my brother the first Nolan film, & he didn't even finish it, because he grew up in the mid-60's, & Adam West IS the one & only Batman.
Not saying this to belittle anyone's opinion or thoughts, but if you don't like the universe where these stories are happening, then you're not going to like the characters, & vice-versa.