ayyubov,
I have to say it is true. I had an idiot attorney who did not know where to file I 485 so he sent it to the local office. In next two months I had FP, medical done and a letter for interview. Then we (attorney and me) went for interview, and the officer asked general questions ie what do you do, show me your letter of employment, "Oh so you go to school, nice", did you commit any crime etc... So after 15 minutes, he was ready to stamp my passport with GC, and UNFORTUNATELY he realized what kind of case I have, and said: "Well this was not supposed to be filed here, I will send it to Nebraska".
It is being 4 years from then....
But then, I "heard" many cases have been approved like this ie maybe the attorney was not an idiot