Tried it, since I played a lot of SC1 back in the day.
Have to admit I was a bit disappointed. Don't get me wrong, the game's fun an' all, but the first StarCraft had a compelling narrative to the single player campaign. This one just rehashed WarCraft's story. A story that wasn't all that good to begin with.
SPOILER ALERT!
An unknown threat. An unlikely savior. The tides of darkness, the salvation of unity.
End of SPOILER ALERT!
That being said, the missions were enjoyable and the intermezzo point'n'click parts refreshing. I'd like to try the multiplayer portion of the game. Seems like it might be fun.