Let's put it this way...I played SW:Rebellion for years after it came out for one major reason, the space battles. I played ST:Armada for one reason, the SW mod space battles. My passion for star wars has always resided in the space battles. I always wanted a large scale control over space battles and I wasn't getting my fix until EAW came along. It's not really all that I wanted, but it's a very good substitute.
The ground game...well...that wore thin within the first hour or so of playtime. It's still enjoyable every once in a while, but it is definitely the weaker of the two.