You know, I agree that he shouldn't have collaborated with America's foreign policy following the sino-soviet split, but I don't think that even puts him as a major candidate in the running.

Edit: He also really should have given the sparrow thing a test run, and there are other criticisms to make, but these are still lesser than the original one. There was bad theory and bad practice in the Cultural Revolution, but overwhelmingly its biggest problem was endangering the revolution that Mao led to establish the PRC in the first place, something for which he deserves credit on account of poverty reduction, drastic increase in life expectancy, land-redistribution, etc. Oh yeah, and the whole "opposing Japanese and British colonialism" thing, since the KMT rolled over for that, but hopefully that goes without saying.