I am mildly disappointed. Man of Steel is a good modern superhero film, but for something that's supposed to be a start of DC Cinematic Universe, it leaves a lot of rooms that need improvements.
Let's start with the good things. First and foremost: the action. Man of Steel provides the largest scale of action and best visual effects I've ever seen in any superhero movie. The Avengers and Iron Man 3 are soundly K.O'd.
The actors are great. I can feel the characters' emotion through even their slightest gestures and expressions. Special mentions go to the menacing General Zod and his minions, Pa and Ma Kent, and Russell Crowe's Jor-El. The theme of identity crisis and making choices is cool, realistic, and perfectly fits with Superman.
And don't forget Hans Zimmer's majestic soundtrack.
Now here come the bugs.
Goyer has obviously been influenced by Chris Nolan's storytelling, but I wish Nolan had been more involved in the writing of the script. It's overall story and structure is great, but it could really use some refinements. Flashbacks and time skips happen pretty often, almost randomly at times. They mostly work as narratives but don't have as much impact as say, Batman Begins' or The Dark Knight Rises'.
Slow motion isn't used in this film, something I both miss and feel relieved about. To compensate, Snyder shot this film with single setup hand-held camera. That's awesome. Shooting with this method, if being done correctly, will allow the audience to feel the experience of being in the film, running around with the hero as if chronicling his adventure like a good pal.
Unfortunately, Snyder just has to force its usage to an unhealthy dose. Hell, the entire film was shot this way. Really, when Supes and Zod clash in the air, it becomes hard to tell where and who they are when the camera covers the area around them. They never really ruin the moment, but they cause those awesome moments to never reach their fullest.
Other than that, there are several hilariously weak plot points like Lois suddenly has super speed, people suddenly know this and that, unclear time frame, egregiously cheesy dialogues and some lack of character developments.
In conclusion, Man of Steel is good but doesn't reach its full potential. However, I do hope to see more of Henry Cavill in the blue suit in a hopefully better and improved sequel.