The game itself only had a few critisisms, Live (fixed) release bugs (mostly fixed) and character development in the story, but it was universally praised for it's factions, balance, and control scheme for the 360 (even EA borrowed some design elements for Red Alert 3's console version).
Yeah, a sequel/expansion would be great!
The game wasn't really good in the state it was released, but you could just SEE how good it could've been with actual support.
I've seen many features and designs pioneered by this game used in other titles in the months after its release, which shows just how good the singular components of it were. If you gave the developers a chance with proper support and marketing, they could create an RTS able to compete with Starcraft 2, Red Alert 3 and Dawn of War 2.