These books are great for getting boys into books and reading... We have around a dozen now covering Transformers, Superman, Spiderman, Kung-Fu Panda, Sharks, Star Wars etc.
I have a four year old who is bang into Star Wars, Transformers, superheroes etc. and we sit down every night to read one of these before bed. He can recognise words, and often recalls whole pages of text.
The only downside is that the majority of the books based on the movie franchises are incomplete and kind of leave you hanging - this is because a) it's hard to get a whole plot into a few pages/words and b) the publishers obviously want you to buy the whole series and complete the story. In this sense the superhero books are better cos they are individual stories in their own right...