Personally, Starcraft has its bad and weak points. I found it insanely difficult at times when playings single-player. I love a challenge sometimes, but some of the missions were insane.
I liked the multiplayer aspect. All three races are perfectly balanced. No one had an advantage over the other. It gets boring after a while, but i play it on and off.
I thought Total Annihilation is pretty good. Kingdoms was mediocre (I never got used to robot mages) If im mistaken, it was the only game that had a ton of add-on units made by the same company.
Chris Taylor, creator of Total Annihilation has just released Dungeon Siege too. Diablo with a little RTS aspects. Played it on a friends computer. If u like Diablo, its great, but the storyline isnt good.
Sorry if I went off topic