I agree - I have always thought our inability to take advantage when we have possession - getting the ball to the opposing box and then pissing it away - is the main cause of our lack of silver over the past few years. I know our defenders make howlers but so do defenders in other teams. What is frustrating is running with the ball, getting to the other box and then stopping and waiting for someone else. The players like Henry and Bergkamp would take on the defender and make an attempt rather than just dick around outside the box. Even if you don't score, there is a decent chance that in taking on the defender, you will get a free kick or pelanty if he brings you down. Worth a crack and even if it works only (say) one time in four, that would give us enough to win a lot of those games we drew or even lost by the odd one.
There is something wierd about the players not going for it. That is why players like Wilshire and Ramsey are what I like to see - they are the kind who are prepared to take the chance and take on defences.