Betsy Woodruff at NRO thinks the worst thing about the treaty is Americans having to submit a report to the UN:

“And we haven’t even started on how self-abasing it would be for the U.S. to comply with the treaty. Every four years, we would be required to put together an interagency report on our disability-rights record (a project that would cost millions), and also to send a delegation (usually of at least 20 people) to Geneva to appear before a panel of international disability-rights experts.”