I don't remember the title at all, so it's difficult to say anything precise, but what made it horrible, aside from obvious reasons like acting and story, was lack of basic research and aesthetics. I remembered mostly that the movie was about an alien ship arriving on Earth. It's entrance was covered in depiction of our solar system. With 9 planets. It was after the official redefinition to 8 planets and 4 dwarf planets. Minor thing, maybe, but it was a fact relevant to the plot and pointed out by characters.
I didn't have the strength to watch it to the end.