Mitch is a fair answer--swinging and missing on a QB you traded up to the #2 spot to get--only to see him suck is the kind of draft pick that sets a franchise back.
Kevin White would be #2. Dan Bazuin #3. Chris Williams #4. Take your pick of Shea McClellin, Gabe Carimi, or John Bostic for #5. I'd go Bostic--because minus 1 preseason play (you know the hit I'm referencing) he sucked.
Shea at least broke Rodgers' collarbone on a sack and was unbelievably misused by the bears/Lovie/Trestman/Mel Tucker. He's a bust based on production, but I'm inclined to give him a little leeway because he was a finesse 3-4 edge rusher who the bears played at every position except the one where he racked up double-digit sacks in Boise. You know, the one he was good at...
Carimi and Leonard Floyd I'd lump together in 'had decent year when they left' but Carimi was out of the league a year after his one okay year in Tampa. But they get honorable mentions.
Another honorable mention? Kellen Davis. Don't care if he was a 5th rounder. Dude was trash.