More wisdom from Seth Godin:
Criticism is difficult to do well.
Recently, we’ve made it super easy for unpaid, untrained, amateur critics to speak up loudly and often.
Just because you can hear them doesn’t mean that they know what they’re talking about.
Criticism is easy to do, but rarely worth listening to, mostly because it’s so easy to do.
via Seth’s Blog.
Reading this I immediately thought of online reviews.