I understand the need for secrecy, but somehow I think the Founders would be appalled at a secret court whose proceedings are secret, especially when it appears to be nothing more than a rubber stamp for the government.
Bush's NSA spying on Americans (remember that?) was supposedly run outside of FISA, but eventually obtained the FISA Court's stamp of approval.
United States v. United States District Court, 407 U.S. 297 (1972) [the "Keith" case]