This is a good, solid fantasy adventure. It is not a “wow great” kind of movie but definitely enjoyable to watch, at least if you are a fan of fantasy, magic, dragons and such like.
The movie is based on a book which I have not read although I believe it is considered as a young adult book. The movie seems to reflect this in that it has a fairly simple, straightforward, adventure plot. This is a movie made to entertain with magic, adventure, a bit of humor and visual effects. Nothing more and nothing less.
In my opinion it does so fairly well. I do like Jeff Bridges in his role as a rather wacky hunter of evil witches who have fallen into a dark and uncaring attitude towards the world around him. Uncaring about everything except slaying of witches that is. Ben Barnes, portraying the apprentice and Seventh Son is unfortunately making a rather bland impression. Then Julianne Moore is definitely better as the evil witch.
No movie where fantasy, magic and dragons are among the main themes can be without special effects. So, not surprisingly, there are a fair amount of them in this movie. I think they are generally well made and complements the story well without being overdone.
On the whole I liked the movie. It is a simple but solid adventure story with just the right amount of a few humorous remarks, nice visual effects, a bit of romance and action.