I admit that I don't know much about PC gaming. What I have gathered, however, is that Blizzard is so protective of their IPs that they absolutely do not release anything until they're happy with it (which is probably why Starcraft Ghost is in development hell).
If I were a fan, I wouldn't be too worried. At the very least, it should play well. At the same time, I understand that fans have been waiting like 117 years for a sequel so hopes for the title are through the roof.