My "understanding" of the story (contains multiple spoilers)

Rating: 1/10 (23 March 2015)

1. Cooper is driving around with his kids to catch a drone. This has nothing to do with the story, but apparently someone thought the movie was not long enough
2. We find out the earth is dying and that humanity has no hope.
3. Cooper sends himself a dust message, telling himself to go on a trip so that he can enter the black hole he is already in.
4. Cooper and his daughter Murph drives to the coordinates from the dust message. They find what looks like a military base. Instead of trying to knock or shout "Anyone home?" they try to break in and are immediately captured.
5. NASA is happy they captured Cooper since he is the best pilot for an upcoming space mission. Cooper is asked to fly through a wormhole near Saturn to find a planet to colonize. 12 pilots has been sent before and 3 of them has marked planets as possible targets for future mankind. NASA is working on a formula to manipulate gravity so they can send their whole base into space and save humanity, but the equation is not complete yet.
6. Cooper sends himself another message, via Murph, from the black hole. This time it says "Stay" but Cooper ignores the warning from himself. If he had bothered to stay and find out some more maybe he could at least have told himself to go straight into the black hole and skip the fuss with the other planets, making the movie shorter but it seems they really wanted to have a long and boring movie
7. Cooper goes into space with a small number of other astronauts and a robot that looks like a few metal boxes glued together. Murph is on earth, angry that Cooper went away.
8. Cooper flies through the wormhole and comes to the solar system with the planets they hope to be able to inhabit. The solar system has a huge black hole, Gargantua, and we find out the astronauts already have knowledge about this and somehow still thinks this solar system seems promising.
9. Cooper with crew decides to land on a planet with water, where times goes approximately 61000 times slower than on earth. For time to move this much faster gravity must be insane or the speed of the planet close to the speed of light, but maybe the planet somehow managed to find a balance between the two, even though it is hard to understand how... Instead of trying to observe the planet from space or send the robot to the surface they decide to land and get into some trouble caused by a huge tidal wave, making several years pass in Earth time. The planet is not inhabitable.
10. They fly to the next planet, or it turns out it is not really a planet, it is only frozen clouds. The astronaut that marked this planet as inhabitable (Dr Mann) only did so to attract another space ship since his own has crashed. Dr Mann tries to murder Cooper by headbutting him outdoors. They are both wearing astronaut helmets but only Cooper's break from the headbutt for some reason... Cooper is saved by the crew.
11. Dr Mann tries to steal the ship to escape home, but he messes up and dies in an explosion.
12. Cooper and Amelia are now the only astronauts alive. They have very little fuel and Cooper sends off Amelia to the third planet while he himself heads towards the black hole in his space suit together with the robot.
13. Cooper survives the perilous journey and comes to a library inside the black hole. He ends up behind the bookshelves in his daughter's room. This is how he has been communicating with himself & Murphy. We are told that the wormhole and the library in the black hole are not put there by aliens, but by humanity in the future.
14. Cooper communicates with Murph and Murph figures out the equation. Mankind goes off into space and Cooper is somehow rescued from the black hole and gets to meet his now more than 80 years old daughter again. Mankind must have been able to do all of this without the aid of Cooper though since they had created the wormhole and the structure inside the black hole. His trip to the black hole seems a quite unnecessary, but he has himself to blame since he ignored his own warning
15. Murph takes off into space again to go to Amelia on the third planet. Even though the space station he is already on is heading there. He could have spent the time with his daughter instead since he had not seen her for a very very long time...
The story is so stupid a that a monkey could write something more plausible during his 15 minutes coffee break. I have left out lots of strange and pointless stuff that goes on in the movie to make my review shorter.
Don't believe the hype, this is a terrible movie.