Passive about the active voice

The following is the introduction to an article I received on keeping your writing in the active voice:

“Eliminating Passive Writing in Your PR Articles
Over the past year our editorial department has constantly been reviewing the most common mistakes associated with many of the free PR articles posted on our website. We have identified three major categories of mistakes.”

While I appreciate the sentiment, they wrote the first two sentences in the passive voice. Now, that is not to say (also passive voice), that the passive voice is wrong. In fact, while the passive voice can seem weak, it also can play a valuable role in your writing. Check out this guidance on the passive voice from The Writing Center at the University of North Carolina at Chapel Hill.