This article describes and critiques the judicial reasoning of Indonesia’s Supreme Court, through the lens of the Court’s reviews of subnational laws during 2011–17. The resulting picture is a negative one. Most of the Court’s decisions were critically flawed, with either very little or no reasoning, and inconsistencies with past decisions. Worse, the Court appears keen to avoid hearing important cases that raise difficult political issues, even though the law governing those issues is clear and easy to apply. These inadequacies are perpetuated by genuine uncertainty about the precise jurisdiction of the Court in judicial review cases. However, the Court has not sought to resolve this uncertainty. Indeed, these decisions appear to reflect a court paying little regard to judicial transparency and accountability, and unwilling or unable to act as an effective check on government power.