Earth 2160.
I'd played a demo of a prequel and presumed the sequel would have similar customisation, building units from the treads up, moving the earth above and beneath ground and all that stuff.
I played it for one evening and gave up in disgust at just how poorly balanced and though out it was. Then I reinstalled it because I couldn't believe how bad it was, re-affirmed that the aliens were completely unbeatable and that the entire thing was even more of a waste of time than my first impressions had indicated and burned the box.