Good point on the space battles lacking plot, too. The Battle of Endor clearly has several stages that you can follow from the dialogue and the VFX. The Battle of Coruscant starts in media res, and frankly, I have no idea how it ends. We know the Invisible Hand takes a broadside and crashes, but what's the disposition of the other ships? How does the battle evolve? Why were they engaging at such close ranges? Who were the commanders on both sides? (Grievous was clearly responsible for capturing Palpatine, but I assume he wasn't in tactical control of the fleet.) Endor answered most of these questions and interleaved two other plot threads, to boot. (It's a bit vague on where the Imperial fleet goes after the Death Star is destroyed.) Like the Mustafar duel, the Coruscant engagement was unelegant, uncivilized forces smashing together over a cool backdrop.