I mean, what else were you expecting? We knew exactly what was coming based on how previous massive battle episodes have been. They'll never be my favourite type of episodes, due to their focus on epic scale and cinematography over any kind of subtlety. There's really little room for interesting plot developments or character interactions, which I find to be more interesting. Although it coming full circle by the end was pretty neat.
I found most of the episode to be tense and gripping and horrifying honestly. And I particularly found the last 10 minutes or horrifying, that music you talk about adding weightiness and gravity to the situation. Kind of feel you're judging it on being something it isn't. Out of interest, how could they have done this episode (where the major battle is still the main part of it) to make you enjoy it more?