Unless there's corporate malfeasance, it's counterproductive in the long run to talk so badly about a former employer, especially on a forever-archived blog post. Even if it does feel good to let out pent-up thoughts.
When I wrote a blog post about leaving Apple (https://news.ycombinator.com/item?id=14270897), I made a conscious effort to be objective with the rationale why I left (to grow my technical skills), and not emotionally judge Apple as a company (I still strongly support Apple).