The second F4 is better than the first, but still has some pretty awful moments.
I don't mind them going younger, logic dictates that someone with genius on the level of Reed Richards and Sue Storm would have that intellect as a younger person as well. Don't care about the race difference between Sue and Johnny, maybe ones adopted, maybe step-siblings, maybe not siblings at all and is more of a life-long friend scenario. I've never been all that attached to F4 though, so I don't really care about changes they make. I'm always open to writer/directors interpretations of comics for movies no different than when different writers/artists do new comic lines. Well see. The trailer was alright.
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