I think a lot of Marxists take sympathy with Lenin, and Lenin’s vision, they don’t necessarily like what the USSR became under Stalin. The principles of Soviet Democracy, for example, are appealing to many Lefitsts. “All power to the Soviets!”
That being said, ultimately the USSR serves as a great example of why Vanguardism can be good in overthrowing a bad system, but must be held far more accountable, or even dissolve after revolution. I know many MLs would probably shit on me for saying that, citing the CIA paper saying Stalin wasn’t a dictator, but I still think ultimately the form of government under Stalin and those who came after him is very dependent on who is in power. A more decentralized system would have checks against such issues.
My 2 cents as a leftist that isn’t an ML, but has spent time reading about the various leftist tendencies.
I’ll conclude it by saying I would have loved it if Lenin continued to live and stay in power, I wonder what the USSR would have looked like, maybe even today.