Fantastic Four wasn't horrible. Neither was Suicide Squad, Apocalypse, Ultron, Civil War, BvS, or any of these other recent ones with conflicting opinions. None of these are perfect but they've gotten pretty good at making these films and it's probably not a bad thing that they aren't all for everyone.
Fantastic Four was the only financial bomb in large part because the property isn't that popular. The comics line isn't even publishing it right now and nobody cares.