Let me start by saying that I may completely change my mind after playing Armada or watching a demo.
So what do I mean, when I question whether Armada fits into Episode 4-6? Obviously, the ships are all of the right era.
What I mean is the conflicts of Episode 4-6 were not great Naval battles. It wasn't Pearl Harbor. It wasn't like Star Trek. Or even like Babylon 5 or Starship Troopers.
The original trilogy had a very human scale to it. It was about the underdog and it was about dogfighting.
The single X-Wing versus an unimaginably sized space station.
The Falcon shooting down TIE fighters.
Capital ships were always in the background.
Whether it was trying to escape Star Destroyers on Hoth or the Rebel Fleet at Endor trying to create a diversion as Guerrilla troops try to blow up the shield generator.
Can the Rebel Fleet even go Toe-to-Toe, mano-y-mano with the might of the Imperial Navy? The strength of the Rebels were their insurgent tactics.
Capital ships fighting each other doesn't seem to fit the fluff.
Anyways, it's just a thought.