That is not the case in Chichen Itza. It is an astonishing place.
I was first there in 1974 then after 1989 and nothing much had been added as the Mexican Gov't. prefers to do everything themselves (i.e. "Mexican time") but still more vast than any other ruins I have seen.
I'm certainly not disagreeing the fact that there were human sacrifices to the Mayan gods, just as there were in Hawaii, and by Native Americans, however, they are well worth a side trip to Chichen Itza.