Quick-take: This book was a bit of a slog, but it did have a few epic scenes.
This book was more about politics and in-fighting than Mistborns doing cool Mistborny things.
To be fair to the book, the political discussions were good and well-written. However, that was not why I wanted to read Book 2.
I almost gave this book a low rating, but a couple of scenes, particularly one near the end, were fantastic. I thoroughly enjoyed the scene near the end so much that I went back and slowly re-read the whole section again. I never do this.
The most disappointing piece was The Well of Ascension itself. It was nowhere except the finale, and the finale was not satisfying. It felt like a forced lead-in to Book 3.
This would have been a better book if it ended at the very satisfying previous finale and just dropped the Well of Ascension journey.
I probably would have stopped reading Mistborn at book 2, but the inertia of my enjoyment of book 1 kept me going.