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There were specific reasons historical communism had such a large death toll, and it traces back mostly to the policies that were introduced and the decisions the political elite made.
So I think it's fair to compare actual policies, and not to judge on the basis of whether someone calls themselves a communist, or whether that label gets applied to them.
To my knowledge, Die Linke is not a revolutionary party, doesn't want to force through breakneck industrialization at any cost, and doesn't deny foundational agricultural science. It's also one of the few parties defending the Informationsfreiheitsgesetz (public access to government records) against the current government's push to gut it.
The CDU and the CSU have nothing to do with the NSDAP.
At some point in time in Germany 30% of the population were either part of the NSDAP or the Nazi Army. Luckily most of them were not war criminals and move on with their lives. And yes, some of them ended in the CDU/CSU but also of the SED/Die Linke.
Just to give you an example, around 10-15% of the DDR state officials had held NSDAP membership pre-1945.
Does that make the DDR a successor of the Nazi Regime? Obviously not. The same about the CDU/CSU.
But Die Linke is still the same party as the SED. Same organization, which just voted themselves into different names.
I don't believe they gave up Marxism-Leninism, they just gave the monster a new name and claim it is nothing like its predecessor. They do that a lot, changing the label on the package. Inside it is still the same monster, waiting to be unleashed.
If you want actual bona fide Marxist-Leninists, there's the cultists of MLPD.
And no, the few antisemites in Berlin Neukölln are not representatives for the entire federal party.