I think the movie was amazing and i completely disagree with Dr. Zauis's comments. Lex Luthor wasn't "dumbed down" in this film but rather he didn't have the central role that villians usually get in movies. The movie wasn't about him or his plans, that was a subplot and because it was a relatively unimportant subplot the details of his dyabolical schemes frankly don't really matter.
I think this was a great choice by Singer and the writers because like the title of the movie Superman returns in this film, that's what it's about. It's not just about the story of superman and the villians he faces, it's about Superman being reintroduced and having to deal with the problems that are associated with his return.
And again i'm going to disagree with Dr. Zaius on the issue of the kid, Jason. I think including the kid in the movie was a great idea and a perfect way to add a twist to the epic superman story. And although the kid was a great touch to the film, that's all he was, a little touch to make the film "complete" (if that's the right word). Singer put the kid in the right amount of scenes and didn't let the kid steal the movie away from the other, more important characters. I think only a few directors could have pulled that off and Singer is one of them.
And as my final rebuttle in Dr. Zaius's original post he spent a lot of time making fun of the character of Richard, Lois's fiance and how he basically has no penis (in Dr. Zaius's view). Well i'd like to completely challenge that notion by saying A) WHat makes Richard not a man? Because he helps Lois out in times of need (aka turning the plane around to save Superman) or because he doesn't walk around with an "i'm all that" attitude. IMO Richard is more of a man than most the people in that film and most people in the world we live in. It was actually really refreshing to see Richard not portrayed as an ******* (as people no-doubt expected) because pretty much every film ever made the main characters love interest is always dating a complete douchebag. It's a long played out character setup and boring. Singer, however took a chance and made Richard a stand up guy. Not only does this make for a more interesting story because it creates a dilemma for Clark/Superman because he can't tell Lois to leave Richard and Lois herself really is stuck and doesn't know what she wants. And it's also makes more sense because no one as smart as Lois Lane (her intelligence could be argued) would be engaged to a complete douche.