I've never spent $60 on a game, and I'm not about to, so I can't opine on this one just yet. However, I will say that I think the expectations among the fans for the followups to StarCraft and Diablo II are impossibly high. Jesus Christ himself could have helmed StarCraft II and motherfuckers would still be whining.
Didn't this exact same anomaly that Son_Gara points out happen with Chrono Cross?
People forget that StarCraft's reputation was slowly built over a decade. Sure, it got great reviews when it came out, but its impact would have been hard to predict. Inotherwords, this is just people acting stupid again. Not saying SC2 will end up being as great, just that it took much longer than a week for us to realize what we have.