Vick is definitely a talent. Unfortunately the Falcons D went from average to atrocious over the past two years. I think the key to them progressing far into the playoffs (at least making it to the Championship Game) will depend upon Mora's ability to remold the defense.
Look at McNabb. His skillset is not that different than Vicks. He is definitely not as athletic as Vick, but he does have a lot of athletism. The primary reason the Eagles have made it to three consecutive NFC Championship Games, though, is the defense, not McNabb.