Interstellar was great. I'm giving it a solid "great".
Many flaws, but I think they're all forgivable, given the kind of movie it was. I was a bit distracted by the fact that the whole premise of the movie is probably its biggest plot hole, but whatever. I forgive you, Interstellar. You were pretty awesome.
That'll satisfy my epic-sci-fi needs for awhile, easily filling the gaping hole left by Gravity.