I've seen quite a bit of Chelsea so far (thanks to them being involved in a couple of Super Cup games), and they do look vulnerable. Struggled against Reading, Falcao tore them up, City scored three against them. Their Champions League victory wasn't exactly through great performance either, there was a lot of good fortune on the way. Di Matteo obviously picked up the pieces to make a very experienced team (the reason why they should be favourites for the group) perform better, but I'm really not sure on his ability either.
Reassuring to see the back of Drogba as well.