The blocked Aguero shot in the first half was great defending, as you alluded to in your third paragraph, Skoorb.
The main thing that struck me was we didn't thump the ball, as Chelsea did with the three finishes; if Aguero had done this with the effort Cahill blocked on the line, who knows?
Equally, although our defence left a lot to be desired, for all the comments about Chelsea's concession of goals, they also made plenty of basic errors that they managed to recover.
The only time we really did thump the ball (as also pointed out), we hit the bar. :013: