Finished the campaign yesterday.
The game is nice. It's very, VERY similar to SC1, you can jump in right from the start and play it the same, unchanged way (at least solo). I guess they were wary that changing it too much would freak people. Hard to touch a classic.
So far it seems there is only cosmectic changes, but I'm pretty sure the little additions here and there will have very far-reaching consequences. Multiplayer will decides in the long term.
The way the story is told is quite good. There is lots of little details between missions, and quite a bit of cutscenes, nice.
But sadly... the story itself is quite boring and VERY predictable. Nothing surprising at all.
Worse, it feels very, very much copy-pasted from Warcraft. Seriously. And, as usual, details are retconned away (though, for now, it isn't as egregious as Warcraft where the whole lore has been butchered each time to retrofit the new mountain-sized chunks of rewritten lore), which makes the whole operation shaky.
To sums it up : it's a very nicely told tedious story. The missions are a blast, but the storyline is "meh" to "Zzzzz...". I actually had to spoil myself about the only vaguely interesting moment (the ending, in fact) to find the desire to continue.
Additionnally, Blizzard has put its new obsession (B.Net 2) EVERYWHERE in the game, and has been rather incredibly hypocrital. After a very loud "DRM is a losing battle !" that was repeated aloud all over the Internet to make it appear "we don't want to bother our loyal customers with irritating DRM, we know it's a rearguard fight and we consider it's not the good way to make people buy a game !", you find out that they, in fact, LOADED their game with DRM everywhere.
Nice showing of your true colours, weasels...