The specific quote that was sent to AICN was:
"[it was] sooo bad that they felt dirty and wanted to write letters of complaint."
This is pretty much unverified, so it could be legit or it could be some uber-disgruntled hard core fanboy's reaction. However, the fact that we have the same writers and the same director (Tim Story) on this one as we had on the first one does not bode well IMHO.
The first Fantastic Four movie was pretty weak, but I had hoped that maybe now that the origin story was out of the way they might hit their stride in this one.
I've got a bad feeling about this...