my favorite blizzard game is SC:brood war, but since it's not on the list, i vote WC3:the frozen throne
Diablo 2: LOD.
I think Warcraft III sucks, and WOW sucks you in and costs monthly
Besides SC I voted for D2. Even after you stop playing it can easily suck you right back into playing it. WoW would have been cool if you didn't have to pay for it monthly and it didn't steal your life away from you.

Diablo II was pretty fun and yeah it can be addicting to im just glad the addiction to it for me is gone

World of Warcraft
The Burning Crusade hasn't released yet..
It really doesn't matter what games that haven't came out, what matters is that you a bit experienced or at least seen the gameplay of the game. Come on, some people might've played StarCraft: Ghost during E3 or played the demo of that game.