Myth is a real cool 3d RTS without any resource management (graphics are a little dated but it is 3d - the first one I can remember actually). Its kind of like King Authur meets the evil monsters (you know knights and archers against ghouls and demons and stuff). Really bloody too. You really have to group your men well, and the 3d camera controls are neat. What I like the best is when your me die it tells you "casualties". Believe me, you'll hear that a lot, because it is hard. I've never played Myth2, but I see it on sale a lot too lately. I believe it got good write-ups too.
Be the ball, Danny.