Casting and chemistry gets an A.
Cinematography get an A+
I didn't realized the time until it was over.
It was almost three hours but it keeps you on edge once it gets rolling.
My only low grade and I hate to do this but the ending gets a D.
There is no possible way to show the effects of a Black-hole and the gravity pull. Every time a movie tries to do it the effect is very silly. All of the build-up leads to a impossibility.
Over all the movie is great.