Superman is a Christ-figure. In any incarnation of Superman that is even remotely faithful to the story, Superman is a Christ figure. He can't help it.
I think the recent movie may have laid it on a little thick, as if they expected the viewer not to get it. But it's impossible for anyone familiar with the story of Christ not to associate Superman with Christ on some level, and for those unfamiliar with the story of Christ, it is best to let Superman simply be Superman.
I have heard convincing arguments that Superman is not a Christ figure at all, but rather that (since his creators were Jewish) he is a MOSES figure--arriving in a basket to save his people.
I agree. Superman is a Moses figure. But Moses was a prophetic pre-curser of Jesus. Moses himself is a Christ figure.
Pug wrote a while back about why Jesus isn't a superhero. A lot of what he says is true and a lot of it makes good sense. There are a lot of ways in which Jesus is fundamentally different from any superhero. He didn't wear a cape, he didn't have a secret identity (but he did frequenty instruct people (and demons) not to tell those around him that he was the Messiah (Luke 4:41, Luke 5:14, Mark 8:29-30)). However, any metephor or allusion can be destroyed by focussing on the differences instead of the similarities.
Pug talked mostly about the heroes of the Marvel Universe (and I think most bad things to have ever happened to Superheroes are Stan Lee's fault, but that's another post for another day). Pug contrasts the gospel to Superheroes, saying "The story of the gospels are about fixing what went wrong. Helping people get back to the optimal state of being, in close relationship with God. It is Not the story of some ordinary, talented, but oh, so misunderstood Guy who suddenly discoveres or recieves amazing powers. It is Not the story of a man and his stumbling, and doubting his way towards his own destiny. It is the story of the ultimate sacrifice." And he's mostly right.
But Jesus is more than the suffering servant. That IS a part of Jesus, and without it the story of the gospels would be diminished and Jesus would not be who he is. But Jesus Christ, in addition to being God's son, betrayed and forsaken by the world, is also God, the creator of the universe come in power to overthrow the powers of darkness and bring glorious salvation to this world. Christ is a sacrifice, and it would be both heretical and simply foolish to ignore that. But Christ is also God's coming in glory and power--although neither that glory nor that power looks like we humans expected it to look.
And Superman is a figure of this aspect of Christ. And I think that's pretty cool.