Uhh, his deep ball? He doesn't seem to have the patience to wait for a receiver to get open deep and doesn't seem willing to take a hit to complete a big pass. He can take punishment, but seems only wanting to give it out. Look at Palmer yesterday, that is what an NFL QB does. Waits for the right moment to throw the bomb and knows he might pay the price for it, but does it anyways. Can't see Young doing that.
Besides its a joke to compare his arm to Vick. Vick was capable of being more accurate in the college game, but his coaches only had him through bombs because a guy with a cannon like that is a rare commodity. Young doesn't seem to throw deep much because his arm can't match Vick's so of course he will look more accurate for now. Get to the NFL and its a whole different game. If he can't throw it deep his team is not going to move the ball. The safeties will be parked 10 yards from the line of scrimmage and make big plays all day long if they never have to backpedal.