From my perspective China did an amazing job at handling COVID, it is other countries that fucked up by not taking it seriously - not doing quarantining properly, waiting until domestic spread was out of control to take half-hearted and unenforced measures to slow the spread. In comparison China took quarantining and contact tracing very seriously and was effective at stopping their domestic spread early in the pandemic.

You could blame China for most hypotheses for Covid’s origins: lab-leak from gain of function research, unsanitary wet markets, or not following proper cleanliness procedures for field research. But I think those things (besides lab leaks) could have happened in literally any developing country, and most probably would have done even worse at containing it than China.

What I don’t think you can blame China for is the virus escaping their country. They would be (rightly) be under a ton of fire from the international community if they had not allowed non-citizens to leave their country at the start of the pandemic.