I heard about that. They lyrics are kinda creepy though.
To: Sony Computer Entertainment & Media Molecule
While playing your latest game, "LittleBigPlanet" in the first level of the third world in the game (titled "Swinging Safari", I have noticed something strange in the lyrics of the music track of the level. When I listened carefully, I was surprised to hear some very familiar Arabic words from the Quran. You can listen to part of the track here:
Apparently it's offensive to Muslims to have words in the Quran set to music.
Which is strange, since words from the Bible appear in all kinds of music. Of course, Christians don't care if you paint a picture of Jesus, either, or if you name a teddy bear after Jesus.
I probably offend Muslims just by brushing my teeth, or taking out the garbage. Of course, there was that one time when I had a garbage can full of Qurans...
It depends on how much of a completest you are. I want to say that I got through it in something like 12 hours.
In the 360 version, there are certain achievements that you can't get without playing through more than once, however. Also, certain choices you make in the game will have positive and negative consequences (though not in the overriding sense as you would see in a game like Deus Ex). There are a few cases where choosing to kill or spare a person will affect whether you have access to a weapon upgrade, for example.
You'll probably want to play through it at least twice.