I watched the whole thing, but I kept waiting for a payoff of some kind. It was generally slow and ponderous, accurately depicting Victorian and early 20th century life in Great Britain. As a period piece, it was actually quite good. But as ENTERTAINMENT, not so much.
I should say I'm not into dramas, though if they move along and there are enough interesting things to watch, I've been known to like a few. Among the "interesting things to watch" is a climax of some kind - a payoff for watching the whole thing to get to a glorious or exciting ending. This didn't have ENOUGH excitement, and to be honest, it seemed very ponderous and eventually kind of boring. The ending was, to say the least, anticlimactic and unexciting. In fact, it was kind of puzzling.
From a technical aspect, it's an excellent film. The actors did a marvelous job in their roles. I think the problem is that the story of the main character is, fundamentally, boring in and of itself. Boring people can lead exciting lives, and the man wasn't boring, but in many ways, his life was.
So, overall, based on a rating system of Hated It, Didn't Like It, It's OK, Liked it and Loved It, I didn't like it. Which is a shame given the apparently high production values and quality that went into making it.
So, if you LIKE very well done period piece dramas that essentially go nowhere, this will be a five star rated one for you. Not so much for me.