Being a huge Marvel comics fan, I had pretty high expectations for this movie. But my expectations were satisfied and even surpassed! The movie had a lot of background on a variety of different mutants, many of which we haven't seen in the previous 3 movies. I thought Liev Schreiber did a fantastic job as Sabretooth as well, much better than the Sabretooth incarnation in the first X-Men film. I'm very much looking forward to the next X-Men film, as I'm anxious to learn more and more about all the mutants that were introduced in this movie.