1. Why is Beast with the bad guys?? I don't know. Probably similar to why Colossus joined Magneto in the comics as he's tired of Xavier's hippy bullshit.
2. At this point, McAvoy and Fassbender>>>>>>McKellan and Stewart for me. Stewart and McKellan always felt lie theater actors, which they were, playing comic book characters, McAvoy and Fassbender feel like actual characters in an ongoing series. Probably helps they were more fleshed out under the tenure of which these actors played the characters.
3. Hans Zimmer is doing the score for this film. So, even if the movie is awful the score should still be phenomenal. You can hear the music buildup to the imminent violence that will follow this scene, sounds extremely Zimmer-y.
4. I guess it's just the circumstances of the writers trying to use Magneto in every film but it always feels like Fassbender Magneto's goals are just to kill somebody in every film. In First Class it's Shaw, in DoFp it's Mystique then the President, in Apocalypse it's everybody because his daughter died, now it's apparently Jean. He apparently builds a mutants-only community in this film and I hope they get more into that but I fear the focus maybe more on killing Jean.