I played Command & Conquer Red Alert, Red Alert 2, Tiberian Sun and Generals plus the add-on. I must say that I really enjoyed Red Alert 1 and 2 (especially the first part had awesome music) but Generals just beats all, although it's a whole lot different from the rest. I know Generals had a lot of negative critic, most likely because gamers are too busy expressing their hate against the enormous EA. I don't care, I only judge the game, not the one who made it nor plublished it. I made maps for Red Alert (if anyone wants them, just let me know) and tried it for Generals. I said tried, because Generals doesn't run anymore with the latest drivers for my GeForce FX card. Leveldesigning itself went pretty good and the editor is quiet easy to understand.
What is the best C&C-game in your opinion? And use some good motives, don't just yell something without backing it up with good reasons.