[raganwald]

...because every one of us reading these reviews is thinking "I don't want my app to suffer the same fate. Let's make a note about what not to do..."

It's also easier to remember tips and dictums when given an example to ponder than if provided in a vacuum.

[robryan]

Good way for the author who works in the area to be able to organize their thoughts on the app. Without the structure of the blog post it can be hard to clear your mind and gain some insight from what you are seeing.