I can't disagree with you. Pacing is a preference, so is editing, etc. Although I don't remember any of that bothering me, I would bet the professional critics are all on your side.

The way Interstellar hit so many of my narrative buttons overrides any reservations. I'm attracted to stories about humanity trying to survive an apocalypse so that was a point in its favor. I'm attracted to stories about space exploration, ditto. I love stories about time travel. I loved the structure of the story, the way it twisted back on itself. And an uplifting story with a relationship between a father and a daughter at its center? I can't think of another movie like it. I liked watching all of the characters, even the villain. I cared about what happened to Anne Hathaway's character after the movie ended; in fact, this was the first story since Fringe that had me looking for fanfic. Naturally, there isn't much. Sigh. Now I'm wishing I'd nominated it for Yuletide.