I have zero problem with them doing the origin again. It's not only one of the most famous modern myths of our age, but it's crucial to do what this film seems like it's trying to do; show how the world would react, for better and worse, if Superman really did appear.
Plus, the last time we saw the origin on the big screen was in 78 (unlike Spider-Man who got his origin repeated 10 years later). Yeah, on TV there was Smallville, but that was a VERY decompressed version that tried to spread the butter over ten years' worth of bread and lost all coherency as an actual origin story by the time Clark had already fought Brainiac, Doomsday and Darkseid and almost married Lois before he ever put on the spandex.
For a film trying to reinvent Superman for our age, I think doing the origin is absolutely crucial.