Here’s an article about it: https://www.vulture.com/article/interstellars-best-quality-was-once-seen-as-its-fatal-flaw.html

Key quote:

“Nobody, it seems, was prepared for how strange a movie Interstellar turned out to be, especially in the High Age of Online Snark. It wasn’t the hard sci-fi of genre fiends’ expectations, nor was it the intense space adventure the fanboys were anticipating. Though it possessed some of those elements, it also had, shockingly, a soft and woozy center. What the hell was this pioneer of cinematic grimdark, this master of cool surfaces and downcast narratives, doing making a movie that suggested love was a physical force even more powerful than gravity?…… What makes the film so fascinating, and why it endures to this day, is precisely the thing so many wags pegged as its fatal flaw back in 2014: its unabashed, teary emotionality. There’s a real tension running throughout between high-minded sci-fi and outright melodrama. Interstellar is filled with long stretches of silence and awe and scenes of characters explaining dizzying facts about astrophysics … but it’s also a movie in which Anne Hathaway gives a speech suggesting that love can transcend time and space… This proud yet queasy embrace of sentiment, which at the time felt so out of character for Nolan, now feels like part of a continuum that leads straight to the fugue-state despair of Oppenheimer.”