I like it, too. Nice find.
What bothers me a bit about it is that it's directed towards those who are overly critical, rather than those who aren't critical enough.
To me, many people are more spontaneous and playful than critical and determined, and it's a lack of critical ability that holds them back. Of course, this was written 11 years ago, and times have changed a wee bit. It's like a pendulum, I guess.
On the other hand, that might say more about me than others.