I served as a tank crewman in the Marine Corps Reserve from 1991 to 1995. My unit was freshly back from the Gulf when I joined them. They had a lot of problems with the 60s breaking down, due to their age. It was a lot of work keeping them going. By their accounts, they did well against Iraqi armor. They had DU sabots for the 105, which was more than a match for their encounters.
The reactive armor on their tanks was for show. One night, a tank crashed into a wall, tearing up the reactive armor. To their surprise, the reactive armor boxes were empty. I don't know if that was a universal situation, or just for the reserve troops.
The T-72 could definately penetrate an M-60. Some accounts I heard, only being faster than the enemy allowed them to prevail.
My unit lost one tank to a mine. No one was injured, but it reportedly really tore the tank up, first two road wheels gone, shocks gone. Did not penetrate the hull though.
My TC in tank school told me about an encounter where a ZSU 23-4 engaged them. They lost everything stowed on the outside of the right side of the tank, really rang their bell.