I was expecting this movie to be solely entertaining; to tickle the brain with "what ifs". I was not, however, expecting to give it a 4/5.
I have often wondered what would happen if Superman, or Batman, or Wonder Woman, what have you, wouldn't have had such a North pointing moral compass, and this movie answers that.
Having watched the trailer prior to, and, of course, watching plenty of Superman movies/cartoons/t.v. shows, and reading the comics, I already had a base knowledge of what Gunn was working with, so the trope wasn't boring as some others have claimed. It merely added elements that made the story familiar, thus negating the need to expand on where Brandon Breyer came from. The basis is the same, and the 'where's, 'what's and 'why's are irrelevant. He's an alien.
Gunn added many parallels that made the movie that much more enjoyable, such as name alliteration (Clark Kent/Brandon Breyer), set the story in a tiny town in Kansas, mentioned, however briefly, that Brandon was sickly at first and how the adoptive mother worried for him during his first days on Earth.
I have read other reviews and some have said that there was nothing that explained the MCs actions, just that he was plain evil. I disagree. I think that the space craft that he was sent to earth in (which had been hidden on the farm, just like Superman's) was what set him off, the boy beginning to act strangely once he turned twelve; as if hitting puberty made him sensitive to the message that the craft had been holding for him all along.
I recommend this movie to anyone who has ever wondered how things would play out if the all powerful were not so kind. Others say the sudden ending was awful, I feel like they cut it off before they answered too much, leaving our overactive human brains to think and speculate and devise our own theories, which is just as good as having answers, in my opinion.
If you have the opportunity to try Brightburn out, do yourself a favor and do so.