Part 2 came out of nowhere, and as soon as it came, it was gone. I think there could have been more involving Bastian finding Ike and pals, and maybe some more explaining why Ludveck did what he did, other than "I can rule this country better than you can~"
Part 3 was fun because it brought back Ike and pals to the game, and had you help the Gallians, like in FE9.
Part 4 was a worthless pile of drivel, which didn't need to be included into the game, and could have been left out entirely. I mean, you have to fight against a god. What kind of stupid concept is that? I see nothing wrong with fighting against someone blessed by a god, or, by some powerful magic, but A GOD OF CREATION THEMSELVES?
It's just dumb. You should have fought your way up to fighting Lekain, not fighting Ashera.