This film is basically the origin story for Spider-Man. There is one thing in particular that adults need to watch out for, and that's the incredible scale of violence, and the feel of impending doom throughout the second part of the film. There are not many times we see blood, and the gore factor seems pretty low, there is not excessive swearing, but some may find some scenes scary, because of the overtone in this film.
I give it:-
VIOLENCE 6.5/10 (two deaths, one off camera, but you see the body, the other death is completely on screen)
LANGUAGE 3/10 (a few mild swear words here and there)
SEX 4/10 (a few compassionate kissing scenes)
All I say is, is small kids watch out for the violence, and tone of this film. This film isn't for those who don't like any kind of violence. The film overall it is a great film and has an spectacular music score by Danny Elfman , the man behind many Tim Burton music scores, including amazing actors, and including a mini cameo from Stan Lee himself.
Enjoy watching the film, its a great film to start with and this franchise is ever expanding, with next year seeing the next Spider-Man film.