What can I say? I loved the Command and Conquer games. Started with Red Alert, went later with Tiberian Sun.
After Tiberian Sun, my father managed to grab Red Alert 2, which I fell in love too. One of my favorite game of all times. And Yuri's Revenge expansion is one of the best out there. Spent many hours playing those games online.
Generals and Tiberium Wars are also awesome games. Red Alert 3 too. Many hate it, and while I agree it doesn't come close to RA2, it is a solid game.
It really makes me angry EA canned this series. I will never forgive them for killing Westwood and Bullfrog Productions.