I have seen it. I have the DVD and have watched it more than once. There's a lot of violence and in some parts even I would cringe at the brutality of the scenes, but even so I liked it enough to watch it again. It's not a film for children. Here in Brazil it was not recommended to children under 10 years old but I think the rating should be still higher due to the violence.
I read the comics and it was a blood bath, too. I consider it as a film for adult viewing.
I, too, found it odd that Lois would be in a (sexual) relationship with Superman instead of Clark, but after it got clear that she knew his true identity I could accept it.
I really liked Lois. I think she was very true to the character as an intrepid and intelligent reporter and all her actions were very believable and spot-on. Her speaking to Jimmy: "Oh, for God sake! Don't be such a girl!" is very Lois.
The scene where she searches Martha because nobody is able to understand what she is feeling is very moving:
Lois Lane: Mrs. Kent, you know as well as I do that your son died in Metropolis last week. Look, I'm not here as a reporter. I...
Martha Kent: Then why are you here, Miss Lane?
Lois Lane: I don't know exactly. Maybe it's just... I don't know if he told you but we have been seeing each other for the past few months, romantically, I mean. And I know the rest of the world adored him and misses him now that he's gone, but no one else on this whole stupid planet can know what it felt like to really love him, to be loved by him or how it feels now every minute of every day, like I'm broken. Like I'm the one that freaking monster pounded on.
Lex was very well written, too. He was sagacious, evil to the bone and had some of the best quotes of the movie.
As with MoS, I could do with less violence, but the movie is good enough that I can overlook it.
Andreia