The end battle has multiple layers to it, when you are in the Independent or House paths you are basically sneaking up behind the battle, covered by the Securitrons and the soldiers being bussy defending the Dam from the Legion in the Parts you don't access during those paths, it only becomes an "epic" battle in the NCR and Legion paths, admitedly this are the ones that suffer from the limitations of the engine harder, but you still have lots of options in them, and of course, there are attacks ocurring all over Vegas when the Dam Battle breaks out, NCR Emergencya Broadcast lets you hear about the concecuences of your actions during the Battle, you can hear about the fall of Forlom Hope, or it's successfull defense, Camp Golf fallign to the Legion or the newly reinvigorated army fighting them off, or one of my Favorite moments, hearing the guy on the radio talkign about the Omerthas blowing up the NCR embassy.