Michael Fassbender, Storm's powers, Prof. X's resurrection and more
Worst: Wait, Kitty Pryde has what new power?
It's one thing when you play with the power set of a lesser known character such as Sunspot (um, when did he learn to fly again?), but when you stretch a popular mutant's abilities so much that the entire plot hinges on it, it's another. It was always strange that Ellen Page's Kitty Pryde didn't get the prominence she deserved in the earlier X-Men films. Kitty has arguably been one of the most popular characters in the franchise after Wolverine, Jean Grey, Storm and Rogue. And since her debut almost 34 years ago, her powers have remained remarkably consistent. She has the ability to pass/walk through any physical object without it harming her, she can use this power to walk or climb in the air (always the toughest one to understand) and when she phases through a mechanical object she can destroy it (sort of like when you throw water on a computer). What she's never shown is the power to phase someone's consciousness anywhere let alone 40 years in the past. Granted, Marvel has a history of having its characters mutate new powers. Just see Emma Frost's secondary mutation of a diamond body and Beast's multiple transformations (he's on no. 3 right now in the comic books). It was a way for the filmmakers to make Kitty an integral part of the story without making her a centerpiece as she was in the original comic book storyline of "Days of Future Past," but it's still a bit eyebrow raising when you think about it.