See, I don't want to just fight an avatar of Alduin, I want to fight the real deal. Even if it's not accurate lore wise, because he's a "god" and you, some measly dragonborn, can't hurt him. I WANT to hurt him dammit, I vote Gameplay > Lore in this boss fight.
I agree. We should be able to kill Alduin, make him our [censored], and take his place as God of Time, or whatever. Bethesda needs to learn how to make a story epic.
Lesson 1: Be able to kill a god.
Lesson 2: Be able to become a god.
Seriously, it's not like TES lore is beyond untouchable or anything. Oblivion has proven that handily enough. Lets at least spice it up if we're going to be messing with it, right guys?