I saw it last night and it was even better than I was hoping for it to be, its very very funny and there's a lot of violence, way more than I was expecting also a lot of swearing, when we were coming out I heard someone say they were very surprised it was only a 15.
Hit Girl is just amazing, definitely the best character, I think she was supposed to be 11 and it seemed most of the swearing and violence came from her, it was a bit freaky though to see her fighting in this school uniform and pigtails.
I know people who went who said they didn't think it was that good so I think its a film where you either love it or you hate it but the majority seemed to love it.