I read one of them. I'm not one to get caught up into book series, but this one was pretty interesting. Especially with Angel and Iggy (Iggy is awesome, man! Although it's not true that you'll get instantaneously blinded by looking directly into the sun. I've tried it with one eye, when I was younger and stupid, and I quite literally stared for 3 hours, and I can still see just fine out of that eye).
But yeah, Iggy was awesome. I also liked how Patterson actually did his research with birds when he wrote the books.
One comment - they have the shortest chapters EVER. One of them was practically two paragraphs o_O