I do feel like fan expectations were kinda all over the place for Man of Steel, and that's what sunk the movie more than anything else. It was a weird phenomenom. I remember seeing an early screening on iMAX, and really enjoying it. I went on Facebook, and wrote a good review. I said there were some flaws, sure, but overall the film was enjoyable and set the groundwork for a better sequel. And all the other reviews popping up on social media said pretty much the same thing. Fast-forward two days, and the poor Rotten Tomatoes rating emerged, and people were savaging it, and all of a sudden people who had previously liked the film were back-pedalling and saying they actually didn't like it to fit in with the emerging consensus. And the fight scenes that everyone was raving about as some of the best action ever committed to a superhero film were suddenly this hot-button issue about disaster porn excess. It was amazing seeing the narrative of a film's reception being essentially rewritten before my eyes.
As regards the big fight between Superman and Zod at the end of the film, I still think it's excellent. It's been crapped on over and over these past few months about Superman being irresponsible and indifferent towards human life, think of all the wreckage he's leaving in his wake, etc etc. But I was here before Superman Returns, I remember the reception to that. For about a decade now I've had to read constant, CONSTANT posts like, "Superman can't be a ***** in the next film, give him a villain he can actually HIT, I want crazy battles that level city blocks, this should be like Dragonball Z on film!" etc, etc. Then when we finally get what so many of us have clamoured for all these years, suddenly it's, "Hmmm, Superman should be more restrained and delicate in his approach to villains, think of the property damage and the cost of building repairs!" The grass is always greener.
I do think Superman killing Zod was problematic. I can appreciate in theory Snyder and Goyer's conclusion that Zod needed to die rather than just go into the Phantom Zone with all the other rogue Kryptonians. But I think they wrote themselves into a corner and went about it the wrong way. It's the METHOD of Zod's death, the Bruce Lee style "BAM! ICE COLD MOFO!" swiping neck-break that just feels excessively intimite and brutal, like cold-blooded execution. And the whole way they set it up with him doing it to save those three idiots who couldn't just run away felt really weak. But for me it was more of a "Huh, didn't like that" flaw than an "OH MY GOD THE CHARACTER OF SUPERMAN IS DESTROYED FOREVER!" outrage.
For me, a far greater flaw in the movie is the character assassination of Pa Kent. Rather than the inspirational figure he is in the comics and in the original movie, he's presented as well-intentioned, but inadvertently subjecting his son to emotional abuse. Rather than setting young Clark on his path to heroism, he just fills him with self-doubt and self-hatred, and turns him into a target for bullies. He's so dedicated to making Clark afraid of his own power that he sets up a scenario where he'll die so that Clark will be traumatised and cower in the shadows feeling guilty long after he's gone. My problem with the tornado death scene is that it totally botches the tragedy of his death. In the original film, Pa Kent's heart attack is genuinely tragic, and to this day one of the only scenes in a superhero film that can bring me close to tears, because for all his power, it's something Clark is powerless to stop. Saving Pa Kent from a tornado is something Clark IS powered to do, but he doesn't, and that for me sends the exact opposite message than you might want to take away from that death scene. And so Pa Kent becomes this obstacle, this ghost he has to exorcise with the help of his "real" dad Jor-El in order to embrace his destiny. That's not right for me. For me, Pa Kent IS his real dad. The "you ARE my son" scene is beautiful, and still one of my favourites in the movie, and I wish Pa Kent's portrayal throughout had been more consistent with that.
In my opinon, Man of Steel is roughly on par with The Amazing Spider-Man in the quality department: both are reimaginings of a superhero origin story already memorably committed to film, that make some goofy decisions that feel like being different for different's sake, and they're both ultimately a bit light on plot, but they're well-acted, and set the goundwork for a compelling film universe that should result in superior sequels. I'd say Man of Steel is better, actually, but they both fit a similar framework of strengths and weaknesses. But the difference is that The Amazing Spider-Man came sandwiched between two of the biggest superhero films ever that got all the attention, and overshadowed it in the quality department, so the film was later rediscovered on DVD as a bit of an underappreciated gem. Man of Steel, however, was THE superhero film of this summer, and came with the burden of HUGE expectation, only enhanced by the amazing trailers. People were expecting something legendary. And so when instead we got a very good superhero film that isn't quite on the top-tier of the all-time classics of the genre, the backlash was massive and it felt like a huge failure.