I would rather see the comments on posts or blogs that point out when something is wrong and why it's wrong. I'm not a dba, and sometimes that "bad advice" someone gave is something my company is practicing. Reading the Why of not doing it that way helps me to change bad practices, plus I can learn from others mistakes, and can (hopefully) avoid making a mistake in the future.

In my opinion, many of the 'mistakes' I see written are common misconceptions that haven't been challenged. I seem to see the same mistakes repeatedly blogged about, or done in the workplace. Seeing some one else challenged for a practice you're currently doing can be a huge eye opener for some.

From a different point of view, this article has good concepts that can be applied to work place problems too. When coworkers are practicing methods that you know are harmful, it contains good suggestions on how to confront them.