As for me, I didn't really like "Tsar". Although the goal authors of the movie made for themselves was quite interesting, much attention was biased towards the darker side of Ivan the Terrible's personality. Due to that, the tsar mostly ended up depicted as just a spoiled child never becaming an adult in his mind yet assured in his divine purpose while slowly sliding into the complete madness.
To make such a plot more convincing the authors didn't hesitate to enrich it with the circumstances never happened in the actual history. It should be admitted though that some of them worked well yet the others just made no sence. By the latter I mean such things as allusions towards ancient Roman emperors who fed lions with christians while the movie's "Tsar" feeds bears with whoever he dislikes; the appearance of a sofisticated device invented by Leonardo da Vinci and reworked by "Tsar" into a huge torture machine; the building of a huge "theme park" of torture facilities; the list goes on. By this the movie nearly fails to make the viewer understand Ivan the Terrible as a person but rather tries to make the viewer hate him and his time instead.
Because of this to many viewers the movie was rather insulting than entertaining or educative. Same goes for me. To me it isn't right to observe a political figure from the history of your very own country in such a one-sided way.
So, if you'd like to see the movie with the goal to understand Ivan the Terrible as a person rather than a politician I'd not recommend you this one.