I finally watched the last movie this weekend. I loved it.

(I've watched the whole series and binge watched it and the other movies a few times.) I thought the plot in this movie was very tight and plausible throughout. Unlike the movie where the King & Queen came to visit and I thought the storyline of the servants rebelling was a bit farfetched and implausible for what they would really do in those circumstances.
I missed Violet. It was a punch to the heart seeing her portrait,

although, I felt it was fittingly in the right place.
I loved all the "Easter eggs," (references to past events during the series.) I thought they came up naturally in the conversations. And I thought it was a great finale. No spoiler, but for those who haven't seen the movie yet, make sure you stay through the end credits. It shows extra clips of what happens to all the characters and really gives a nice closure.
I will miss this series, which is ironic as we got more movies than we ever thought we would get.

But, I think it's because we did get a finale. Whereas before, in the back of our imaginations, life at Downton continued on in the same way, whereas, now we have a series finale. So, I'm sad but satisfied.