This is such a lazy defence of the movie. There are plenty I've heard who understand the science of the film perfectly and still have problems with it. I've also spoken to people who enjoyed the movie with no knowledge of or interest in science/space, who either found it adequately explained within the movie's exposition, or were able to enjoy the movie with a little confusion in their minds and then ask questions to fill in the gaps later.

It's arrogant and elitist to think you need to "know about science" to understand the movie, it's just not as complicated as people like you want to believe it is. You're not part of some special club because you've watched a few Neil deGrasse Tyson videos. And the movie you love isn't immune from criticism because it's got a bit of science in it.

Problems with the movie that have nothing to do with science:

• First act felt very rushed and devoid of emotion and scale. World felt interesting but poorly drawn when there was so much potential. There was little sense of peril in the crop failure scenario. Everything was explained by Dr Brand in a 2 min scene, no time to grow attached to that world, connect with it. The task of saving it and the feeling of what was at stake just didn't hit as hard.
• The character are extremely broadly drawn, and just not likeable enough. The only relationship of any weight was Cooper/Murph, which lead to a great scene on Miller's planet, but was completely lost once the 23 years had passed. At that point the emotional heart of the film was gone. None of the rest was believable, there was very little chemistry, very little to become invested in as a viewer. There was next to no emotional satisfaction in the deaths of characters or the eventual saving of mankind.
• Motivation for most of the characters was sketchy at best. Other than the overarching "save humanity" there was no clue what these people were about. Cooper's decision to leave just doesn't ring true with me, or at least wasn't portrayed well on screen. Mann came across as a template scifi twist anotagonist. The Brand/Edmunds thing just seemed tacked on last minute. I think it's a Nolan thing, his films often feel cold and emotionally stunted, it's not what he's good at.
• The dialogue at times ranged from forced to completely cringeworthy. I'll ignore the "Lazarus" line as it's been done to death. Will rewatch to find some specific examples, but the Brand love speech comes to mind, and the exposition in general felt heavy handed. There wasn't a lot of subtlety, it was heavy on cliche and at times the emotional punch was completely lacking.

That all said, I thought it was a great movie, the second act was stunning with some great set pieces. It's far from perfect, but that kind of thinking doesn't seem to factor over on this subreddit.