When I first became an AvP fan, I thought all material was canon to the franchise, however I soon became enlightened and discovered that the community has established that the films are the only true canon, not any of the media related to the franchise. I, then, started following that path, somewhat (everybody else was doing it and I believed at the time that the opinion of the community counted a lot), until I discovered that some community members have even banned A:R and the AvP films from their own canon. To me that went against everything the community and I (to a lesser extent) believed in; everything I got from this site and sites like this indicate that the movies are the ultimate source of canon. Therefore, I have come to the conclusion that the fans don't have the authority to determine what is or is not canon to the franchise. Therefore, community beliefs aside, there is no reason not to consider this EU material as legit.