To me, it seems like a grey area. On one hand, you would want all articles read to be the ones on your site. However, one site will not get all articles and at times, there are 3rd party articles out there that may be written in such a way or brings up a point that may be a good thing to discuss. The lack of moderators on this site does allow some flexibility and to date, no definitive answer in regards to posting other reviews/articles has been given. Personally, I like the articles written and published on the CD site and rarely have any objection or find anything to debate on; it's the other articles from other sites/writers that I at times find troubling or don't agree with.
I would understand if Grant pulled the 'plug' of 3rd party links to other articles/sites, but they do provide a basis for many of the discussions.