I would put them both more in the middle than most - I hate the magic aspect of the ending of Interstellar, but I also find the Joker's final act uncompelling, especially the boats rigged with explosives - but the aspect of both that I appreciate is a large-scale ambition that's rare these days (but that 2001 also certainly has). Technology has made low-budget ambition still produce high quality results, which is fantastic, but there's also something about what you can do when you throw hundreds of millions at a more audacious concept. I found Dunkirk disappointing because it was (by nature) much more straightforward.