OK, I've thoughts about that. First off, nobody hates the USSR more than I do. Like, viscerally and, back in the days I was a prominent journalist, famously
BUT... There were some things the USSR did well. Objectively well. And I am not talking about beating Hitler.
But it was MUCH, MUCH better than anything in Russia's history...
And having subpar healthcare available to everyone is much better than having zero healthcare for 99% of the nation.
And, even in that environment, some Soviet doctors were quite good.
So, until I hear Bernie praise our actual political system, I am not really bothered.