Watched it today.
First of all, I think this topic should be in the Weird War board. The movie has more to do with fantasy than history - think early Weird War Tales comics, with supernatural themes, but no monsters/super science/Nazi zombies.
That being said, I have enjoyed it very much. It's definitely amongst my top weird war movies (not that I have seen many of them...).
What I liked:
- the story,
- the visuals,
- the characters - they might lack depth (especially that the main protagonist is amnesiac), but they fit in the film,
- Soviet tank porn!

What I disliked:
- unnecessary scenes (at least two, both at the end - the dinner scene and the ending monologue),
- minor historical issues, e.g. all tank rounds explode, main character's T-34 is crewed only by 3 men etc. - these can be ignored if you treat the film as fantasy,
- the White Tiger - it's made on the basis of an IS-2, and while it doesn't resemble it anymore (apart from the wheels, which are hardly visible), it doesn't resemble a Tiger either.