What are some games like Natural Selection 2?

I actually own this one. Haven't played too much of it though.

This one? http://www.savage2.com/en/main.php I really like Savage, just sucks XR is dead. I like the theme of savage 2, so maybe I'll download it and try it :)

Not really the type of gameplay I'm referring to. I'm looking for something similar to like CoH type gameplay (someone building and upgrading) while it's also possible to have real players as my units. Battlefield 2 is a great game though.

You don't say? ;P

Tremulous. I'd play it to death a few years back. Shedding a manly tear of nostalgia.

Definitely looks a lot like natural selection haha. After looking it up I think the alien controls feel weird in natural selection to me because my camera doesn't rotate. I was watching gameplay of Tremulous and the camera rotates as their running along walls and rooftops. Maybe that's why I wasn't feeling the alien gameplay in NS.