I saw a video a while back on YouTube that claimed that Zack Snyder was good at creating "moments" but not "scenes." What they meant was that his movies could have iconic moments, or were visually stunning, but the connective tissue was usually weak.
Taking BvS as an example, you had all these trailer moments that made it into the film - Batman and Superman facing off on the rooftop, Superman engulfed in flames as the courtroom burned down and he had failed, Batman watching in horror as Superman and Zod destroyed the city, etc. Those are big moments. The scenes in between these moments are way less effective. They used an example where Clark Kent is speaking to Perry White at the Daily Planet and the whole scene is about 14 seconds. This is one of those important little scenes, to either build character or move the plot along, and it's like Zack couldn't be bothered to put much effort into it. He's just trying to push us to the next epic moment.
That's kind of how I feel about Man of Steel. There are some great moments with great music, and then there are some flat attempts at moments, like when Law & Order guy gets an epic death scene... but because the scenes were weak, and I don't know that character's name, it really doesn't stand out at all. There are cool moments, visually, like the destruction of Krypton, but since I don't know or care about any of these characters, I kind of just want them to blow up and get to the actual movie. And then there are some head-scratcher "moments" like having Superman snap someone's neck.
Many of the MCU films - and Civil War in particular, I feel - nail both the big moments and those necessary character scenes. That's why fans can geek about Ant-Man going giant for the first time, and about how Steve was sobbing at Peggy Carter's funeral. Or Black Panther's introduction in-suit, trying to kill Bucky, and about Wanda and Vision just... trying to make dinner together.
I remember all the big moments from Zack Snyder films, but they don't always land, because what happens in between big moments is often generic or poorly written. It's more of an issue in BvS than in MoS, but it's why I didn't buy his and Lois' romance at all, and why my patience for his battling Zod wears out well before the fight is over.