Enner, CD keys wouldn't be a problem. They're a simple and fairly effective means of controlling duplicate players in the online space. Anything more than a CD key or initial disc check is
far too much security in my books. In fact, I make a habit of removing the CD checks for the sake of personal convenience and the safety and longevity of the discs themselves.
Ceric, to each his own, I suppose. I haven't played a Blizzard RTS that I've disliked. For me though, WarCraft 3 struck the right balance between planning and actual on-the-fly strategy. Of course, I spent many an hour within WarCraft II: Battle.net Edition all the same. That was years before the third installment was to be released, however.

I'm sad to say that I've never been particularly good within the RTS genre. I'm much more adept with its turn-based cousin. To that fact, Blizzard games were about the only point I had to get into the genre... and Rome: Total War, if you want to count it under RTS given its quasi mix of the two styles.