The security forces, under attack by gangsters and terrorists using bribes and threats (of murder or kidnaping) are becoming less effective. This has made it possible for Sunni terrorists (al Qaeda and several local groups) to keep operating.
Luckily, we weakened the enemy enough to make this flaw less than fatal--so far.
And I hope that there is enough accountability in the Iraqi system for voters to pressure or punish leaders for failing to provide security and economic growth.
I'm still cautiously optimistic that Iraq will turn out well.