On a good note about Hawkwing, he did have the third home in the british and irish 2000 guineas (beating the 2008 champion miler and a Breeders Cup Classic winner), he also had a goffs fillies million winner and currently has the favorite for the 2009 triumph hurdle.
Admittedly I didnt think he was great at stud, but after having a quick scoot at the Racing Post site, it would look like he has done as well with most his mares as any other sires that have covered them, so perhaps he just hasnt been given a huge amount of quality.