For the Broncos, that pick was actually the #14 overall in 2010! Horrible. I don't have any scoop on what happened in Denver, but fwiw here's something I wrote before the 2009 draft:
"I love A. Smith's ball skills and field awareness, but I have regretfully crossed him off my 1st-round value list.
I'm ok with short CBs. I'm even ok with short CBs without fabulous straight-line speed. But when a short guy with average speed also puts up average numbers on the cone, shuttle, and vertical, the time comes to worry, IMO. Quickness and leaping ability are what the little guys usually rely on most."
http://www.patsfans.com/new-england...alphonso-smith-darius-butler.html#post1323516
Even so, I didn't think he'd be a bust, just a limited player.