The issue is Vronsky
I have seen this twice, tried to give it another chance, and i cannot STAND this actor in this role. It annoys me more than anything, he is very annoying in the character. The chemistry is completely off!
Of course, there are other issues as well, like the odd choice to make this like a play, but I truly think if Vronsky were played by a different actor, this would be slightly more tolerable.
It baffles me because Joe did well casting Keira opposite Matthew Macfadyen in P&P as well as James McAvoy, but this was a total miss.