I liked WarCraft 3 a lot. I liked the "Frozen Throne" expansion better. And I liked the "Bonus Campaign" in Frozen Throne, that was like a mini-RPG, the best.
I am geeked for Worlds of Warcraft. Everyone about that has "big enourmous hit" written all over it. I've played a few MMORPG's. They are a lot of fun, but they all share some basic problems. Blizzard looks like it has a plan to address each and every one of my concerns that come from prior games.
They are the Gold Standard developer. They produce games that are as close to perfect as possible. I'm sure it will be amazing.