Michael Vick is not a good pure passer.
Michael Vick is a very good QB.
His completion percentage or yardage has never been very high, but you can take such a different approach with him at QB.
He has proven that he can play behind a horrible O-line. When everything collapses around him, he'll still make a play. That's something that was painfully obvious when the Falcons went from playing with Vick to without him.
Or the time he buys so his receivers can get open. Really, tell me which target he's had in his career? He was that Falcons offense. I wouldn't be surprised if Vick had another amazing game. Especialy against the Lions. And if Kolb struggles and would be benched, Vick could put up career numbers in the passing column.
He's thrown 73 TDs to 52 Ints. That's nothing staggering. In this day and age it's quite mediocre.
Thing is, he ran for 23, as well. That's 96 to 52. That's a whole lot more respectable, already.