The Charger's have an amazing passing game because of Philip Rivers. There is no debating this, the guy is an amazing quarterback that is severely underrated. I personally think that they need a better number 2 receiver, although Malcolm Floyd could be the man to do this.
I actually like Ryan Matthews and personally think that he should just be the featured back, with Mike Tolbert taking goal line snaps. But their offensive line needs a little bit of work, both for the run game and pass protection
Oh and did I mention that Philip Rivers is amazing?
I see the defense as the biggest weakness of the Chargers. Eric Weddle is a beast of a safety, and Jammer is a man, but their other safety and other Carson, not so much. Their run defense is not the greatest, and they need better pass rush
I think that Norv Turner is a good coach, but I don't know if he will be the one to take the chargers to the super bowl.
It is a shame that you guys lost Nate Kaeding, obviously your special teams had enough trouble before that happened
Finally, Philip Rivers is damn good quarterback.
Overall I see the chargers with about 12 wins give or take 1 (loses/close games to Green Bay, Chicago, Baltimore, the Dolphins, and one other random team)
Good luck to the season, I love the Chargers (and Philip Rivers if you couldn't tell).