Look in the Superhero Forum. †here are numerous threads of discontent there.
If you want to see why everyone is upset about it go to your local Borders Books or Barnes & Noble. In the graphic novels section find Essential Fantastic Four Vol. 3. The original Surfer Story is presented starting in issues 48-50, ( tho not exactly at the beginning of #48 and not all the way to the end of #50). Do this when you have time to read for a half an hour or so.
Numerous characters were deleted, subtle character development moments were dropped and tho it's not all in those isues elemenst from other FF stories were thrown into the film which are not part of the Surfer storyline. To faithful comic book fans it's a travesty.
"The days have gone down in the West behind the hills into shadow...How did it come to this?"