Ultimately, the online aspect of SCIV is what makes it a step forward in the series. But there's still something missing in the story. Remember the mode in SCII where you could move from country to country, winning gold to spend in the shop? This mode included sometimes arcane, sometimes revealing paragraphs of story throughout.
Having a compelling fighting system with hundreds of moves is significant, especially when Internet play is part of the mix, but it could have been enhanced by the rich SC mythos surrounding a demonic blade that preys upon the very essence of humans. This seems to be the only part missing in a game that, in all other respects, is the finest new-generation fighting game ever made.
Verdict: Buy it