Well, I love every scene so far. It is quite neat to actually see what happened to Dutch leading to his insanity in RDR1. I liked his original, robin hood like mindset at the beginning. It's a shame that it got tampered by scumbag Micah, that little rat!
For Arthur Morgan, I originally thought I was not going to like this guy. That has changed, I like his chemistry with other gang members including Dutch himself, Lenny (WHERE ARE YOU LENNNEH?!

), and John Marston. It was nice seeing him become sort of a big brother figure to John at the end of the story when he helped John escape. I felt quite sad that he had to die from that disease. His character development indeed felt like what Mary said about there being good in him, but fighting a giant. It seems that the giant got beaten in the end, though that's what I think.
Okay, that's all I can think of for now, I just wanted to share some thoughts.