Personally, I think Janet Suzman was awesome, Michael Jayston was a great Nicholas, Gretta Sacchi was terrible, Ian McCellan was ok-ish, Meryl Streep would make a good Alix, but I'm kind of shocked, and we need to get Medvedev out of politics NOW, maybe as an actor?
Keep in mind I've only seen Rasputin and Nicholas and Alexandra.
I want to someday soon produce my own amateur movie on the Romanovs. I've got a pretty good cast, too, in my opinion.
I think it's fun finding popular people who could be in future Romanov movies. We'll be laughing if they DO make one.