People who hate on projects are those that have never attempted to create something on their own. It's kind of like how the easiest person to sell something to is a salesman. Most people's default reaction to anything is scepticism. People who have tried to create something on their own, and undoubtedly encountered other's scepticism, can skip the apprehensive stage and get to the meat of a project with an open mind.
If only it were so simple. For a contradiction, just see the GP's link to harthur's blog. One of the critics is Steve Klabnik, who has definitely created things on his own.
Sometimes all sorts of people thoughtlessly act like jerks.
