I'm also in the camp that if we had actually taken more of the huge amount of good chances we create then we could have overcome our goals against tally - especially considering that we have conceded heavily in a few games which skews it a little.
Of the frustrating games we have lost or drawn e.g at home to Rotherham, Millwall, Middlesbrough and away to Hudds, Watford, Norwich, Ipswich, Cardiff we should certainly have scored more to put these games to bed.
These ones hurt more than the ones we have been well beaten in because we easily did enough to win all 8 of these quite comfortably and yet didnt.