Aliens? Hell yeah! Up until this game it was all about the GDI and NOD forces pitted against one another. Someone at EA thought they could just include a new race and that is what they did.
Considering EA developed this it is understandable that there were no issues with production value. The graphics at the time were top notch and once again the cutscenes have famous actors (e.g. Michael Ironside).
Finally, "building" soldiers does not happen one-by-one but instead this is now squad-based. You recruit squads and the good-old level-up feature from previous games were kept so the longer a squad survives the better it'll become. Also, upgrades are now important to add new features to the units. I liked how this was brought over from Generals.
We have a long and decent campaign with an interesting story. And this cannot be a true command and conquer game without Kane who also returns. You have some ingame database that helps you with the story-telling and entries are given once you complete sidequests within missions. Another likeable concept.
All in all, this is a decent follow-up to an already famous and successful franchise. I never liked Tiberian Sun but Tiberium Wars made me like this franchise again.