star trek: Into darkness why the rating is 8.3 I can't get because

Rating: Null/10 (19 May 2013)

Enterprise ship is trying to save they own crew, not all the people
while Mr.Benedict Cumberbatch( khan) ship is falling on the city there million of people are dead in that damage
why they didn't destroy the ship in the space? what the screenplay is that?
Are the writer of this movie Roberto Orci, Alex Kurtzman
As the famous director Mr. JJ abrams even didn't get this point
I think IMDb is not looking into the film content they are concentrating on the famous directors i think
One thing to Ask I am not aware is IMDb built for directors?
For this film I would give Only rating of 5.5 for the story
and 7.0 for graphics.