The main plot is about a team of explorers who travel through a wormhole in an attempt to find a potentially habitable planet that will sustain humanity. It paints a dark picture of our future and explores how different people react to the pressures of life.
Interstellar is a long movie (almost 3 hours) and moved slow in a few parts - perhaps the film's editors wanted us to experience the monotony of space travels? That said, I found it to be a very enjoyable story - I even chuckled at the way that the lead character tried to explain a strange twist of fate and not even consider a divine explanation.
Overall, I liked the movie and, on a scale of ten, give it ★★★★★★★.
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