eagles vs niners game

I'd like to hear some real thoughts on this game, I'm thinking of betting big on the eagles with the 13.5 spread and i can't understand why anyone would bet the niners.

My thinking is this, the niners are the worst team in football by far, they have absolutely no offense and a somewhat decent defense. Some people get swayed by week 1 when the niners beat a very overrated and weak rams team at home and the eagles of course lost to the falcons. Also it may be a mistake to think about last years game much but they can't be overlooked here as the eagles dominated the nfc with winning almost every game by double digits and won all but two meaningful home games by double.

I want to hear the people who are betting the niners side of this is as i can't see the niners scoring more then 10 points, and thats pushing it. BTW this post is assuming McNabb does play so dont give that as a reason cause theres no way id bet it if hes not.