Yeah, one thing that did jump out to me was that the film respected the audience more than most comic movies did. You didn't have to be shown whatever it was that Xavier did a year ago. You knew what the result was. X-23 acted like an actual little girl from time to time. Xavier felt like a real, old person with degenerative brain, and other health issues. Wolverine acted like an actual, worn down, borderline suicidal alcoholic. His killing didn't feel out of place because from the first time you see him you can an idea for where he is emotionally. Stephen Merchant felt like someone who was going out of his way to repent for past deeds out of guilt.
To take another comic example, think about the Avengers movies. Whether it's Cap, or Hawkeye, or Thor, or Stark, or Widow, they all seem so polished and sure of themselves, and like they're putting on a show for each other and the audience. In Logan, it is more like you could be a fly on the wall, watching more real-type people interact.