i didn't really like it much at all. without trying to spoil it too much, i hated that for the vast majority of the movie, he didn't give much of a crap about saving people who needed it, but instead focused only on fighting the bad guy. the one thing about superman is that his duty as a hero comes before his duty as a warrior, and they completely ruined that aspect of his morality. he's known as a boy scout for a reason.
i stumbled across this [WARNING: MAJOR SPOILERS:
http://thrillbent.com/blog/man-of-st...nce-you-asked/ which pretty much sums up everything i thought about it and more. it's written by mark waid, who's a big name in the industry.