Days of Future Past is the newest entry in the X-Men franchise, centering around Hugh Jackmans Wolverine who has to travel back in time to change the present in which Mutants are being hunted by high-tech robots called Sentinels. He has to work together with a troubled Charles Xavier (James McAvoy) and a young and angry Magneto (Michael Fassbender) in order to find Mystique (Jennifer Lawrence), who is about to become the lynchpin in the prosecution and near-extinction of mutantkind in the future.
I don't want to talk too much about the story in this movie, because it does a very good job at throwing you some curveballs. However, the foundation of it is a battle for Mystique/Ravens soul.
Now there is no question that this is probably the best of all the X-Men movies so far. It's a great summer movie, the action scenes are inventive and impeccably executed. The variety of the mutant-powers in this movie alone makes it worth the price of admission. A few of the supporting cast stand out especially, first and foremost one character that I don't want to get into to much because he has such surprisingly cool scenes. But Portal throwing Blink, played by chinese moviestar Fan Bingbing, comes in a close second for me.
But apart from being a great summer movie, it also holds up as a great movie in general. The story works surprisingly well for a film including time-travel elements. Those are not known for their solid story, but rather for plot holes and nit-picking and making diagrams with straws. This one is actually pretty easy to follow and reasonably logical. It's the continuity of the franchise where it shows a few cracks. The movie clearly serves the purpose of fixing a few things that went wrong in the previous movies, but this mission actually works against it at times, when things go completely unexplained.
Characterwise, the movie puts all of his focus on Xavier, Magneto, Wolverine and Mystique, who are all so good that I am inclined to forgive the movie for not giving us a single new mutant with anything resembling a deeper backstory. The closest we get to that is one tiny inside joke for comic book readers. Still, you feel for all of the mutants in the future, even with a lack of actual characterization and had it been done any other way, the movie would have become very overcrowded.
If you are an X-Men fan, definitely watch this, it is a return to form and a great movie. If you have not watched any of the X-Men movies though, maybe catch up first, because things might get confusing for you.