Great movie but not a masterpiece

Rating: 8/10 (22 November 2014)

First of all I need to say that it is quite rare to see a decent sci-fi movie. Interstellar is a great movie because it tries to be as accurate as possible regarding scientific facts.
But it's not a masterpiece because of small glitches left and right on the movie. For example, the "Lost Pilot who - by almost an accident - got back to NASA (and they accepted him because he was the best)" looks like a cheap TV show rather than good script. I know that this gets explained later, but still, not good overall impression.
The other problem is that the Director repeats the same effects from previous movies, like Inception. And the scene where worm-hole travel is explained is actually stolen from Alien.
Ofc those aren't huge script problems, and there's still originality on it. For example, Prometheus was terrible IMHO, because it followed step-by-step the same things that happened on previous Alien movies. On the other hand, there are even better (=you don't know what to expect) scripts like District9's.
Imho, the problem is not the fact that Interstellar steals sfx or ideas from Contact or Inception. The one thing that keeps this moving from being a classic sci-fi is the fact that it has a clean and absolute happy end. Did anyone understood what happened to "2001: A Space Odyssey"? On Contact, did we communicated again with Aliens? Did Neo liberated all people on the original Matrix? (no). Bladerunner? You need to let something to the imagination of people (like the end of Inception) instead of trying to reach the absolute and not disputable happy end.