I'm a massive Nolan fan, but the first time I saw Interstellar I was not at all a fan of the black hole 5D bookcase climax. In fact, I kind of hated it.
Now?
I think it's one of the most brilliant endings ever, the movie as a whole is absolutely one of Nolan's best, and it's one of my all-time favorite sci-fi movies as well.
It's just incredible, and has only gotten better and better with age.
That said, I rewatched the second half again recently, and the *only* thing that still kind of bugs me is how brief Cooper and Murph's reunion is at the end. After all that time, how did they not spend at least a couple days catching up? It's an emotional scene for sure, but I would have liked to have seen them together just a bit more. Or at least have been given some kind of *indication* that they spent more time together. Brand sure as hell wasn't going anywhere, so it's not like Cooper couldn't have waited just a bit longer to peace out.
Unless the plan was to bring her back to the space station? Though, I got the distinct impression he was going to start a new life with Brand on that planet. Then again, maybe the space station eventually makes its way to that planet? Who knows...