The new FF movie was recently on, and I heard that it was SOOO terrible that I just couldn't even bring myself to check it out to see for myself if it was true. The previous two movies didn't exactly set the world on fire either, and people didn't seem to care for them. Marvel has done such a good job with their movies, and it seems like they've managed to get pretty much every other character and property "Right." except for the FF. The Avengers, Thor, X-Men, Cap, even Ant-Man was a success. Yet they can't seem to get the FF. What gives, and can anything be done at this point? Should they not even bother with a reboot? For me, when I saw the preview and heard that they weren't using anything from the comics, I knew that it wasn't going to be as good as the other movies and properties (Although I didn't expect it to bomb to the extent that it did.).
I feel that the problem with the FF is that it is all about family. This does not sit well in today's society with many relationships fractured and people in multiple marriages etc. I am not saying that this in itself is wrong but I feel that the FF represent a stable unit, which is not an idea reflected by society, unlike the Avengers' and X-Men's fluid roster.
So in short it is the subject not the characters.