I really like SC, WC3, and WoW. I never got into Diablo much. I LOOOOVE the story of the single player modes on both SC and WC3 (I've played through all the campaigns on both games 4 or 5 times). I also like how much you can customize scenarios on those games.
WoW is a very very good game, I've played it a lot, but in terms of things I like (strong story and the map editors) I'd have to say I don't like it quite as much as SC and WC3. And due to the nostalgia factor and my natural inclination to like space and science fiction more than Tolkien types of fantasy, Starcraft all the way.
Long story short, I voted for SC!

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Excellent response. Lengthy and tells WHY you like the choices you made, which, in this case, is the plot.
I like RTS because the AI, or at least opponents play intelligently and the amount of units allows games to NEVER play repetitively. Starcraft plays too fast for me and I hate games where I must master execution to be any good, when strategy games are about CHOICES you make.
Look at chess. This game has 0 skill needed in execution, as in physically moving the pieces. Choosing what to move however, IS what determines player skill.
I like War3 because this execution bar is significantly lowered from SC, yet it retains strategy and even more complexity than SC, though the races are similar.