Their offensive line is terrible. I'd say they're the worst in the league, but sadly, the state of offensive lines leaguewide is just disgusting. Defensively, they have nothing besides one or two pass rushers and Asante Samuel (who really isn't that good in his own right - missing him that much just tells you how poor the rest of the secondary is).
The only reason they're where they are now is because of Michael Vick. Like the last two seasons with McNabb, this team can't consistently put together long, methodical drive. They live and die by the big play - the question is whether a team can contain it for long enough. Minnesota did last night, and the Giants did for three and a half quarters.
I'm interested to see what they do come playoff time. It's going to be all about matchups and whether Michael Vick can survive behind that swiss cheese o-line.