I like Henry Cavill as Supes, but I hate Zack Snyder writing him.
In fact, I am probably happy with all of the actor's portrayals of their characters, but we need to stop having them do stupid things.
I am a bit reversed on the dream sequence part. It needed clarification that it was a dream sequence. Sure it eventually crept into madness, but at this point, the movie was already all over the place, it was hard to tell if the director was communicating that Batman was actually in this place, or if it was in fact, a dream.
The Flash part was weird, but as a fan of the TV show, and someone who initially did NOT like Ezra Miller being cast as cinematic Flash, that part did show enough of his take on the Flash that I am looking forward to it. Other than that, yeah, not needed