While I don't really have an answer to this question I think that the Teen rating for that book should have been for adults. I grew up reading comics hear and there and never saw something that graphic had this been a movie it wouldn't be PG-13. While the writers shouldn't have to dilute their stories I do believe they should be conscious of their aimed rating, and not forget about the young readers who will read the book.
As a movie it was a good movie but what they did to the Mandarin just left me disappointed. I was so hyped for his big screen debut thinking the rings would be some sort of Asgardian tech. I felt cheated all the information pointed towards this epic battle of Iron man vs the Mandarin. While I enjoyed the comedy, the film didn't feel focused and not nearly as dark as the trailers lead on. I can't help but think that if Favreau had stayed on we would have gotten a truer version of the Mandarin. Oh and any one who says but Pearce was really the Mandarin, just don't. I really enjoyed Pearce's performance but his motivation was paper thin. Maybe like Iron Man 2 I'll grow to like it over time.
If your going to use that artist work the least you could do is credit him for his work. Had it been promo work for the cartoon or comics its far more passable. For those that don't know its Dave Rapoza.
On to the actual movie its hard to stay positive to many things going against it and after what happened with Transformers I don't want to see my other favorite franchise be tarnished all over again.