Jotun: Even though the gameplay is what makes the game awesome, not the story, which they dumbed down a million times and made it all wow'y, I'd rather not spoil it. ^^
KavazovAngel: How is it wowy exactly?
Well, all shiny and cute, and everyone is either a noble paragon of benevolence or a real evil bad guy. *Spoiler warning* The whole "the overmind is actually a cool dude, and he has the voice of a friendly old man" and "tassadar is actually alive, as a super cool spirit" making his sacrifice from the first game seem trivial. And Zeratul... he speaks like some fantasy wizard dude. The first game had a far more sci-fi and gritty feeling to it, while the sequel feels more like a fantasy novel for pre-pubertals. They did nail the gameplay though, which we will have to consider the important part here. (but a more awesome story would have been cool as well) :)
edit: "Awaken young cerebrate, and embrace the glory that is your birthright. Know that I am the overmind, and the eternal will of the swarm"
Still gives me goosebumps, THAT kinda stuff is what sc2 is lacking.