I mean, you can succeed in some respects and fail in others. We can blame Stalin for Khrushchev, but it’s very different from how we blame Khrushchev.
But what’s the specific criticism, about what should’ve been done differently?
For Stalin? Clearly the multiple saboteurs, wreckers, etc. who were able to reach the highest positions in government and wreak havoc before being removed is a subject of concern, and Trotsky seriously should not have been left to roam free for a decade and publish his “anti-stalinist” polemics.
I meant for Mao, but for Stalin is also relevant. I still don’t see criticism or suggestions, just “these people were concerning.”