Schon, here you have come to the real issue. What Patrick wrote in his review does not in any way depend on any knowledge of pool whatsoever. Patrick was critiquing the clarity of the explanations. This means that the DVD could have been about aiming in pool, or about building a helicopter. The subject material really has no bearing on whether that material is delivered clearly or not. The second item Patrick critiqued was the novelty of the information. Seeing as Patrick has 7000 posts and is well known on this forum, it would be fair to assume that he has a fairly good knowledge of *what* topics have been discussed on the forums before, and hence would be pretty well informed about whether the info on the DVD was new. Finally, Patrick critiqued the value of the DVD. It was his opinion that the price was not justified by the clarity, novelty, or production values of the DVD. If you notice, none of these things require any knowledge of pool really. Instead, they require knowledge of learning, logic, and clarity of expression. These things Patrick consistently displays in his posts. Thus I would point to this concept as his "qualifications" for posting the review.
Oh, I suppose that the other qualification is that he signed up with a user name and password to post his opinions on this forum, just like you and I. I'm pretty sure that *really* this is the only qualification necessary, as not everyone shows that they are as qualified as PJ in that other capacity described above.
KMRUNOUT