The specific big case which the public knows about would be the domestic telephony metadata collection. Nobody knows about the discussions related to this or any pushback, or how exactly this was deemed to be a legal practice, and so on. This looks very bad as it causes the assumption to be that there is no proper oversight rather than seeing this as a bad interpretation.
Instead of the learned helplessness and assumptions about NSA, it would probably be far better to have an aggressive push for declassified briefings regarding these kinds of decisions. After the Snowden leaks I recall ODNI declassified and published a good amount of documentation in order to demonstrate the IC"s side of the matter, so it is known that declassification reviews for very sensitive subjects can occur when they put ample resources into it. The IC is very sensitive regarding sources and methods, so that's why most declassified information usually comes from FOIAs and specific "IC On The Record" releases. If they would declassify and publicize information regarding these decisions, there can at least be more of a dialogue on the topic using concrete facts versus assumptions.