(I'm a little late to the party so forgive me if this thread exists already.)
Episode N is going on in the dub right now and after catching up on it I think that they did a pretty good job with staying true to N's character and Team Plasma's goal. I was afraid that they would tone N down too much since he's a complex character that the anime hasn't dealt with since Mewtwo in the first movie, but they kept most of his backstory the same. It makes me wonder how the dub will handle N's two sisters, since they're feelings towards the relationship of humans and pokemon seem stronger than N's and I don't think the anime's brought something like that up before besides the things with trainers abandoning pokemon. One thing I wished they touched on more was N's relationship with Ghetsis since in the games he called him "father."