first of all, I will admit that Brady is the best quarterback in the league, but Vick is the best PLAYER in the league
The eagles with Mike Vick in the lineup averages 34 points per game, 440 yards of offense per game and are 8-1 in games that Vick starts and finishes. All of those are best in the league. The team goes from averaging 20 points per game with Kolb to 34 with Vick
furthermore Vick is setting an all time record for yards per game at 340 yards per game with nearly 3 TDs per game as well (just .25 away from Brady's record)
I know Brady is having a great season and he is the efficiency king, but Vick is the most dynamic QB in the history of football. Not is his running devastating to defenses, but it also helps open up the running lanes for LaSean Mccoy (who averages 6+ yards per carry with Vick, compared to 3.7 without Vick)
Furthermore Vick has been incredibly clutch as the eagles are 4-1 with Vick in single possesion games.