Both the Soviet and Chinese first few five year plans accomplished the following:

1. Mass starvation at a few points due to central planning errors

2. Horrifying purges and paranoia that cannot be excused as "errors"

3. Achieving mass literacy and a partially industrial economy in a single generation, from a medeival starting point.

Most good Americans who paid attention in civics class learned 1 and 2 very well without truly appreciating 3.

You have to understand that they were coming from a peasant economy where nobody could even read. It's an accomplishment despite Mao's shortcomings and awful deeds. And look at the scoreboard today. Highest GDP by purchasing power parity in the world. Xiaomi cars are nicer than Teslas, only non-American tech industry, high speed rail, etc etc.