My list:
(1) Mass genocide
(2) Slavery
(3) Choosing to let Satan have carte-blanche control of the earth
(4) Allowing Satan to raise issues and have time to prove them, while not according humans those same options
(5) Choosing not to foresee Satan raising said issues
(6) Allowing so many religions to interpret him and confuse people
(7) Human Suffering
(8) Wars
(9) The Tree of Knowledge of Good/Bad & the Adam & Eve Debacle
(10) Kingdom Melodies