Most discussions about the CSDP are about the pseudo-"Security" part, that is the intervention union. No EU member is under real threat of air attack, naval blockade or invasion, so military bureaucracies all over Europe have been looking into the intervention business in a tragic attempt to 'justify' their budgets and in order to have some at least semi-plausible pressing reason for gold plate procurement and emergency procurement budgets.
(There are different perspectives and interpretations for this, of course.)
What I'm thinking of when I hear or read about the CSDP is something different; it's the under-publication of the fact that the Lisbon treaty is amongst other things an alliance treaty with a much more binding choice of words than the NATO treaty. In other words; I'd like to see the Lisbon Treaty empowered, for its mere black/white contrast on paper is irrelevant in itself. It's the people's beliefs and expectations which matter.
After all, the North Atlantic Treaty is in its actual text no alliance; it's more a "When one gets attacked the others may think about how to help, oh - and here are some more words which the bigger members will ignore routinely."* kind of treaty. It's the allegiance of people to this treaty which empowers it.
And that's what the Lisbon Treaty's alliance function deserves.
So instead of talking how to organise an intervention union or how to pointlessly fusion military bureaucracies with different languages into one we should at the very least have some concerted effort to get the idea of the EU as an alliance into people's brains.
This could be a more useful and important defence policy action in the long term than the stillborn intervention union dreams.
P.S.: Yes, I understand this issue isn't being highlighted more because of special sensitivities in previously neutral EU members.
*: See article 5, "such actions as it deems necessary" and compare it with "shall have towards it an obligation of aid and assistance by all the means in their power" from the Lisbon Treaty..