There were a lot of MOH's awarded that weren't really deserved early on. I know the requirements have been considerably tightened up.
IIRC, there were a buttload of CMHs given out for actions at Little Big Horn, too (which, I'm pretty sure there were several acts of bravery - especially those guys who had to go get water. That had to suck...) which I believe several of them were recinded later, since they didn't quite meet the bar...
Bit giving them out for what happened at Wounded Knee? That was a farce...