I will not add another in depth review to the several I see here on this movie. Nor will I try to evaluate the accuracy of the science behind the plot. Apparently a physicist was involved who had veto power if the script wandered out of the realm of what is at least theoretically true or possible.
But I have never let inaccuracies get in the way of enjoying science fiction movies anyway, as long as the movie is entertaining and otherwise doesn’t insult my intelligence. In the movie Monsters, for example, I read that giant the aliens looking like octopuses could not have walked upright. Fair enough, but it is entertainment, not a documentary.
So the human story of Interstellar held my attention in spite of the length of the film, and despite the elaborate special effects, that story drove the movie and my appreciation of it. I have always liked good time travel movies as well, and theories of space and time come into play in Interstellar as well.
Oh, and I say it is entertainment rather than a documentary, but it is not light entertainment. If you want to give this movie a fair chance, give it your full attention. It is not Mars Attacks, where you can watch it while distracted by life and still pick up on plot details.