Apart from the original Red Alert, Generals is the best one!!
Any unit that asks for shoes has got to be good.
pfft, Tiberian Sun is pretty much the most playable of the lot, closely followed by Red Alert 2. I would then say its Red Alert, Then C&C. Generals is roughly on a par with Renegade in the series. Both very different games, but both fairly sucky. I just reinstalled all of the games off the 1st decade disk recently and played them through.