I do notice some flaws in the movie like the cutting back in between flashbacks and current time (which was awfully done), the movie being too dark, and the fact that Clark Kent saved a bully but not his dad, but overall, I enjoyed Man of Steel. I liked the fact that it didn't have romance and humor but instead, focused more on the origin of Superman and his purpose on Earth. It was really deep and with the terrific performance by Russell Crowe as Jor-El, it added a lot of substance in the story.
The one thing that I wanted to see in Man of Steel (aside from a good story) was non-stop action and destruction; and this movie delivered. It was mayhem everywhere and I loved it. To me, that's what Superman is all about; not some lovey-dovey emo crap like in Superman Returns.
I give this movie 4/5 stars. I look forward to a sequel.