That’s pretty much it. The slant of the Fantastic Four has always been that they are a family of people with super powers, compared to how the X-Men essentially operate a school for youths with super powers. In the FF comics, Reed Richards (Mister Fantastic) and Ben Grimm (the Thing) were best friends, Reed was dating the younger Susan Storm (Invisible Woman) and they eventually marry, and Sue’s younger brother is Johnny Storm (the Human Torch). And in the comics, Victor Von Doom is Reed’s academic rival in college and becomes his arch-enemy, Doctor Doom.
Also, the Thing isn’t nearly as strong as the Hulk, but he maintains his intelligence and cognitive functions all the time since he can’t change back into human form. He’s a kind-hearted tough guy from the streets of Brooklyn, and surprisingly sensitive considering he’s trapped in that craggy, rocky body. And Mister Fantastic and Doctor Doom are two of the world’s most brilliant scientific minds.