You all probably have your own ideas and opinions by now, so here's mine:
Most depressing superhero I have ever seen and I want my two and a half hours back. This movie is every flaw in Frank Miller and Alan Moore's writing come together in unholy matrimony and gone nuclear. Its unrelentingly bleak and needlessly so. It turns the Boy Scout into Blue into a Batman-like brooding figure and it turns Batman into a homicidal maniac and it turns Wonder Woman into... actually, she was pretty spot on, but that's it. The whole movie is stupid and only works because the characters are roughly half as intelligent as they should be. Its basically just Lex Luthor's son (that's right! They don't even give us the REAL Lex Luthor) manipulating Batman into killing Superman and it has the world's greatest detective falling for these machinations hook, line, and sinker. This film does everything it can to diminish Superman right up and including having him go down like a chump when it really counts and the film tries to make it look like he's the sole source of everyone's misery.

In all, the movie had interesting ideas, but for them to work and perhaps even be great, that would require a real director and a decent editor.
Superman should be a fun. You should never walk out of a Superman movie feeling worse than when you went in.