I watched the movie last week. The battle scenes are small but the effects are good. The problem is, it is in Russian, and has English subtitles that were written by a Russian with little knowledge of our language. 95% of the subtitles are sentences that make no sense whatsoever. You basically have to make up all the dialogue in your mind. I recommend it only to those who can live with watching a movie where you have no idea what they are saying. I watched it hoping to see some good large battles, but the movie just follows a small group through some of the ordeal.
In other words the trailer is hugely misleading. I was very disappointed and I'll watch about anything.
