According to this community absolutely yes, but no in reality.

Just as an aside to add a fact to your statement: Marxism is a process that has been used to critique capitalism, as anyone who is intellectually honest should do. For example: if someone says "socialism doesn't work " someone who is a Marxist might ask "okay, historically is this true?" And they would see that several socialist experiments have struggled. Then, as anyone who cares to understand would ask, they might say "okay then what happened to cause this?". And in many cases you will see that Western Imperialism has sought to destroy these movements through various methods including assassinations, and funding groups like the Mujahideen.

Damn. Well, then someone left might say 'well that's Capitalisms fault". At which point it might be justified to call them a tankie. Someone else might conclude" hmm, Capitalist states do not want socialist states to succeed, therefore a socialist state should expect aggressive action from capitalist states. Thus, ONE of the problems with past socialist experiments has been their inability to withstand these external threats." Someone who doesn't critique anything might say "SEE COMMUNISM NEVER WORKS!"

TLDR; One of the key aspects of Marxism/Socialism/Communism is the criticism of past, current, and future political economic systems (capitalism, feudalism, socialism etc). Anyone who ignores this hasn't read much, and should consider whether what they are consuming is state propaganda.