Hallo Rad,
I was just wondering
what made you write the comment:
"the sound of the bombs exploding in the city was very realistic."
I assume you never sat in a bunker being hit by bombs and
you never experienced a bombattack. The only thing
that would come close is the detonating of an old housing complex or  so.
After experiencing such an event I can assure you there is nothing in a cinema sound system that comes even close to detonating real explosives.
Why? Only the real thing is realistic.

You are correct that I have never experienced a bomb attack. Perhaps it would be better if I put it this way:

The sound in this movie made it easy for me to imagine I was actually in an underground bunker, and that bombs were exploding above, shaking evereything around me, echoing throughout the entire bunker .. getting louder/closer as the movie/Russians progressed/advanced.