Good luck trying to find Command & Conquer fans in this community. Few people here have proper appreciation for real-time strategy.
That said, I liked Red Alert 2 and Generals the best; Renegade (the FPS spinoff) was also decent. I haven't bothered with Tiberium Wars and Red Alert 3 due to outdated hardware and bad word of mouth about their gameplay; however, considering that EA got Billy Dee Williams, Michael Ironside, Tricia Helfer, Jenny McCarthy, Gemma Atkinson, Ivana Miličević, Kelly Hu, J.K. Simmons, George Takei, Peter Stormare, and Tim Curry (among a great MANY others) for the cutscenes, perhaps the gameplay would be worth suffering through just to see them.
Also, let's not forget about how Frank Klepacki utterly stomps his Japanese counterparts (save for perhaps Keiki Kobayashi) into the ground when it comes to in-game music.