Take a look at Vick's stats for the preaseason:

Vick:  52.8% completion, 219 yds passing, 1 TD passing, 3 ints (should be 4), 2 sacks, 45.9 rate, 27 yds rushing, 4.5 ypc, 1 rushing TD, 2 fum

I know its only preaseason and the sample size is small but every stat is significantly worse than what he did last season, and anyone watching the games can tell you the upheavel in the offensive line is a major cause for it.  The current line configuration has 3 new starters (1 rookie, 1 free agent, and now 1 guy cut from another team I believe) and 1 returning starter playing a new position which as a unit have played 0 season/preaseason snaps together.  I don't doubt Howard Mudd but offensive line continuity has a definite correlation with offensive success (http://www.footballoutsiders.com/extra-points/2010/offensive-line-continuity-scores) and its showing majorly in preseason, as he's been shuffling the line around every game.  I really hope the shuffling stops after Week 1 but that may be too much to ask.  For comparison here is what other top QBs did in preseason this year:

Rodgers: 78.7%, 395 p. yds, 4 pass TDs, 0 int , 6 sacks, 130.1 rate, 18 yds rushing, 6.0 ypc, 0 rushing TD, 0 fum

Rivers:      68.9%, 377 p. yds, 4 pass TDs, 1 int , 1 sacks, 114.8 rate, 0 yds rushing, 0 ypc, 0 rushing TD, 0 fum

Brady:      56.0%, 379 p. yds, 3 pass TDs, 1 int , 3 sacks, 92.0 rate, 6 yds rushing, 6 ypc, 0 rushing TD, 1 fum

Brees: 56.1%, 304 p. yds, 0 pass TDs, 0 int , 1 sacks, 79.7 rate, 0 yds rushing, 0 ypc, 0 rushing TD, 1 fum

Big Ben: 67.7%, 361 p. yds, 4 pass TDs, 0 int , 5 sacks, 146.6 rate, 8 yds rushing, 8.0 ypc, 0 rushing TD, 0 fum

Again I know its only preaseason, but all these other guys look light years ahead of Vick and none of their O-line's are being reconstructed to the extent of the Eagles (every single one of them is replacing 0 or 1 starters) .  I dont ever remember an Andy Reid Eagles line with this much uncertainty going into a season.   Am I overreacting?  Please tell me I am, otherwise this could be a long season for Michael Vick.