Carson Palmer isn't a scrub QB. He's only 31 years old and he's had some very good season on a mediocre team. My biggest concern, and likely the reason for his recent decline, is his elbow. He hurt the elbow in 2008 and missed most of the season, but he decided not to have surgery and I that may be the cause of his recent accuracy problems.
This guy isn't over the hill yet and 2010 just may have been a throw away season for a guy who was fed up with his organization. Maybe he his arm is still damaged and he needs surgery. Whatever the reason I wouldn't mind taking a chance on guy who twice lead the Bungles to the playoffs.