They've outwardly stated that Shivering Isles took them a year, not 7 months. They're releasing 10-20 hours of new content and all people do is complain it's not enough.
Yes, people complain because we were told we would be receiving huge expansions on scale with SI, not some mini-questline.
Of course I'm buying it, it looks wonderful, I just don't care for being told something and it not happen.