Well, 60s (and I guess some other multi engine helos as well) can have "crosstalk" issues which lead to the wrong engine being shut down with out of limit TQ/EGT/RPM fluctuations.
Then there are the "malfunction happened, pilot followed EP, safety system failed" on a normal flight profile, and then they blame the pilot for not flying a profile that would have allowed greater success (when his profile should have been OK, if a "FAILSAFE" system worked). I've seen that type of "pilot error" blame more than once.
There are mishaps which I have seen chalked up to "skill based errors" when a test pilot was able to handle the recreated mishap, but he knew it was coming, and SHOULD be an above average Naval Aviator (and don't give me the we all should be above average.. I'm talking average Naval Aviator.. if there is more than one, THERE IS AN AVERAGE, AND NOT EVERYONE CAN BE ABOVE IT)