The space battles were pretty good, and I liked the hard point system, but I hated the small unit caps. I would try to have a battle similar to the battle of Endor with my friend, but you coudn't have a big enough fleet. Sure you could have 50 Star Destroyers in your fleet, but only 4 could actually be in the battle at one time.
That being said, I don't think Halo Wars will be very good. From what I've heard, it will only be on the 360, and everyone knows that RTS's on consoles are doomed to epic fail.
ACK ONLY 360?!!!!! *vocal cords disintergrate from level of screaming* Oh well guess that just means I have to get a 360 now, if anything I'll get FEAR 2: Project Origin. Now enough talk about other games besides EAW and Sins! 
Rebels did get shafted big time. I love it how they put together their raid spacial ability letting them bypass enemy fleets, but pretty quick into the game those four units you have to have to use raid aren't enough to take the planet you want. I played one Galactic Conquest as the Rebels with all the planets to conquer. I won because I was lucky and the Empire decided to primarily focus on the pirates. I will never do that again, most stressful game I had ever played. Now that I have my new computer and can play EAW at top graphics I really want to play a Galactic Conquest as Empire again.
The space battles were pretty good, and I liked the hard point system, but I hated the small unit caps. I would try to have a battle similar to the battle of Endor with my friend, but you coudn't have a big enough fleet. Sure you could have 50 Star Destroyers in your fleet, but only 4 could actually be in the battle at one time.
You can actually download a mod or something to that effect that will allow pretty much an infinite amount of ships to be brought into the game at once. I watched a video with a GIANT space battle with that mod, the video didn't finish cause the guy's computer crashed in the middle of the fight because of all the ships. But it was crazy huge!