Let's keep this summary really short:
Presiding Bishop Frank Griswold was an international disaster. His lies to the primates effectively split the Anglican Communion. His partner, Archbishop of Canterbury Rowan Williams, through foot-dragging, interminable meetings, and not following through on punitive actions spelled out by the primates for communion-breaking actions by pecusa and the Anglican Church of Canada, has allowed the continuing unraveling of the Communion.
Presiding Bishop Katherine Jefferts-Schori has been a domestic disaster. Her policy of lawsuits is not only unbiblical (which is obviously not a concern within pecusa), it has cost pecusa millions of dollars and scads of prestige. If you need further evidence of the disaster that has been her regime, read the post below from the pecusa Executive Committee meeting.