Picked up my cope yesterday, finished campaign on Expert (Insane) - it's not bad, not too epic, interesting, interactive, - I was, however, disappointed with writing for 12 year olds (to support the 'teen' sticker), inferior even to the original SC.
As far as multiplayer goes the game is very good, battle.net, however, is not that good. Custom game system is unintuitive and repelling even, Ladder itself with divisions and leagues kills any motivation to advance. Overall the 'new B.net 2.0 has the feeling of isolation and Xbox crowd in it, - with Facebook integration and without chat channels and cross realm play (both of which Blizzard promised to address in later patches and additions).