Don't listen to anyone who says nothing happens in this film. It's chock-a-block full of iconic moments and pure spectacle cinema.
The basic plot has Superman return (duh!) to Earth after an absence of 5 years, dealing with seeing the love of his life (Lois Lane for those not in the know) married with a kid and the world's reaction to his comeback. Meanwhile, Lex Luthor is hatching yet another diabolical scheme which must be thwarted.
I will be the first to admit that this film could do with at least a couple of more 'Super' moments. It blows it's best high-octane action sequence, with Superman saving a plane hurtling to the ground, within the first third of the film. The climax, which I won't reval, just doesn't top it. From a pure fanboy viewpoint, it would have been great to have a good old super powered slugfest utilising all of Superman's skills against an equally powered opponent, but, it doesn't suffer from having a different focus than most comic inspired movies.
It's a gorgeous looking film, seeing as it was filmed on digital cameras. The best way to watch it is on the biggest screen possible. The performances are mostly good, barring Kate Bosworth's portrayal of Lois Lane. I don't know, she just doesn't feel...right. Brandon Routh is a revelation as the title character, easily stepping out of the shadow of Christopher Reeve to make the part his own. Top marks also to Bryan Singer's faultless direction and Mark Ottman's score, keeping plenty of familiar themes from John Williams original score, especially that superb title music.
The 2 disc DVD is the one to get, with a really long, exhaustively detailed look at the making of the film.