Dawn of War is fun, but more in the Warcraft flash-and-jazz kinda way (although it has a quite complex squad system, which I guess makes up for the lacking economy).
But back on topic, I don't know how you could say that AoE3's music was subpar, especially when compared to AoM's catchy but oddly misfitting music. This was the grand age of classical music, and the music really reflects that. I think, no matter what the end game looks like, the reviewers won't be complaining about the music.
"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former."-Albert Einstein