World in conflict, which was and in my opinion still the freshest, newest look at RTS for a long time. Stalker(1) as I'd seen the crazy graphics in a demo on some other game and it chugged out my old computer till it hemmeraged and crashed. Why I thought that made a good selling point after an extensive upgrade I'll never know. I liked it though, bugs and all.
Most recently Endwar, cause I saw it in the shop when I was getting HAWX... it was just a Tom Clancy kinda day. While the graphics are nice, controls ok, the camera was on Rohypnol/ketamene cocktail, and the gameplay was all too basic to hold much challenge. I played it about 10 hours and never really went back to it since.