I guess its heart was in the right place but the story was weak and the characterization ran out of gas pretty quickly. The casting wasn't the greatest and they truly fucked up Dr. Doom. In the plus column the effects were decent and it beats the hell out of the second one.
As a origin story this version of Fantastic Four holds pretty much the original story intact in how the four got their powers but it is a rushed production and somehow feel more like a pilot movie to a TV-show. At least there is some humor in the movie and the necessary bantering with The Thing and The Human Torch is intact but the other half of Alba and Gruffudd is terribly miscast and Dr. Doom is a soapopera wimp.