Few is good, i saw possibly around %30 - 35 of the game already and all of those sectors were pretty small, so i doubt if later on there will be way bigger sectors, may a few sectors will be just slightly bigger. Which will kill the fighting & exploration feeling.
Enemy sights were pi$$ poor so far from what i have seen in the Beta gameplay, so hopefully they will balance the sight distance but maybe in highest difficulty the enemies will be having a better sight, who knows ?