GRAVITY can sell itself. The praises which I think the movie deserves would only help its popularity at the box office.
it doesn't hurt to be on critic's side. However you are right, that movies are mostly critic proof.
With HOBBIT, WALTER MITTY, ANCHORMAN, WALKING WITH DINOS - all vying for box office dominance?
GRAVITY has its hands full. But why Warner didn't release this early October in UK..???