I liked the parts of the movie that showed his childhood and rogue years, but admittedly, even they were weak compared to similar elements in Batman Begins. I didnt like the editing of those bits.
When things really went downhill, was when Zod showed up. The action sequences and plot from then on really made it into a Michael Bay movie. It was like, they made the fights as destructive as possible, just for the sake of special effects. Tar gets torn up, buildings get destroyed, and it all gets so much that I stopped caring about the innocent civilians, unlike in The Avengers, where there is a more real sense of This Is Bad (ie, what is happening to the city). The World Engine never seemed that dramatic or ominous.