C&C TD: great. I still remember the feeling of more than 15 years ago, and my first GDI mission starting. Hell, just the installer was a feature in itself. And the movies: "Yes, power shifts more quickly than some people think."
RA 1: Great. not much to say about that.
C&C TS: Loved it. Probably my favourite, especially because of the music.
RA 2: hell, I loved it. THe gameplay, the speed, the fact that a skilled commander could match the sovjet's single minded brute power by using the full array of weapons the allies had at their dispose. Loved it all.
But than the great darkness came:
Generals: WTF??? Dunno what the idea was behind that game, I don't want to know either. If I could, I would like to ask a surgeon to remove all memories about that.
C&C TW: nice. Not good, not bad, just nice. Except that the aliens had the instant win button once you played for 15 minutes (mothership drop in ennemies base).
RA 3: Liked it actually. I hated that every frakking unit had 2 settings (and I hate every type of micro management). But for the rest, really nice.
C&C TT: nice idea, but I hate Unit caps, I hate needing to move my base around with my troops, I hated the storyline (my god, the actor that played the wife of the commander, I cannot remember any worse actor than that). So all in all, it is now resting and will never be played again.