The famine under Mao was because of his failed policies, though.
I'm not a maoist, so I'm not about to defend his ineptitude, but it seems intellectually lazy to point to these problems as unique. In the 18th, 19th and 20th century, depending on what level of development a country was in, these problems were widespread across all ideologies.
Think about why Stalin is presented as a terrible leader and Churchill as a great one.