Yes! I agree, 100%. I feel like subtle is a good word when it comes to Rogue One, because it didn't spoon-feed us everything, nor was it constantly and relentlessly on-the-go like a JJ Abrams or Michael Bay movie. I'm honestly shocked that so many people describe Rogue One as boring, because I didn't get that at all while watching it. I find the buildup during the first half very interesting, and I appreciate the fact that it's slow enough to let us breathe, which is something that most movies these days don't do. Slow isn't bad as long as what's going on is interesting, which I felt like Rogue One successfully pulled off. Rogue One actually reminds me a lot of a 70s-era movie, which was when movies were beginning to get more fast-paced, but not excessively so like many movies are today.
As for Jyn, I thought she was a great character. I agree that she's handled much more subtly than usual, and I loved that. I'm surprised that so many people think Rey is a better character because she's more "charismatic". Yes, Rey spoke louder and had more punchlines, but I felt like Jyn did a much better job of capturing a wold-weary character who finds a sense of purpose.