The acting isn't terrible and that's about the only thing you can say.
If you read the book, you'll hate this movie as they've gutted it (and not just the "heterosexualization" of Jordan). If you liked BIG LOVE, pass this one by- it's nothing like it. If by some odd chance you read Ann Eliza Young's book (or Irving Wallace's about her) you'll hate this movie as it not only gets everything wrong but takes less than 10 minutes and that in blips. Most of the scenes in the movie last on average about 30 seconds each and there are many plot holes, some from the book and some that the movie cooked up.
Just to correct a couple of historical errors: Ann Eliza Webb was NOT an adult when her father brought home his first plural wife but a baby so young she grew up in a polygamous family and had no memory of a life before it. She and Brigham Young had no children together- she had two sons with a first husband (omitted from the movie) and he had a few dozen with other women. Dramatic as it may seem, she did not flee from an angry mob- she checked into a hotel, gave constant interviews, and when she left town it was on a train and she sued him for a ton of alimony (unsuccessfully as their marriage was not legally recognized). That's an impressive number of errors considering the Ann Eliza story lasted all of about 5 minutes in this movie and could/should have been dropped altogether. (Her melodramatic ghost written tell-none is far from likely to inspire anybody in the modern era; even Ebershoff completely rewrote it and making her family far less interesting as he did so). This movie is basically a waste. I hope that most of the money went to Patricia Wettig's salary as she was by far the best thing in it. I read and did not like the book (too much purple prose and too much historical inaccuracy and too much clearly vanity driven inclusions with the murder mystery, which should have been the focus, taking up maybe 5% of the book's text). Compared to the movie, the book is a masterpiece. Not good, not so-bad-it's-good, just all around mediocre with a heaping side dish of "yeah right", followed by a yawn.