Yeah, the civil war battles feel pretty empty in comparison to the emotional high of the Bruma fight. That being said, there are some other battles in the game that feel pretty epic outside of the civil war conflict.
My favorite quests in Oblivion are the quests which feature battles - the Battle of Bruma, the Battle of the Imperial City (the end of the main quest), the Shivering Isles' many battles. I really loved those quests.
Hey, Bethesda! We need more battles!
