Marxims is such a lazy evaluation system. Discarding culture altogether, refusing analysis of religion, its basically a Proof Of Non work, when it comes to sociology and analysis
The only thing you should be upset about with Marx is his prose.
The other tenet is looking at everything through the lens of class struggle. The modern incarnation of that is interpreting all of history in terms of race. Social mobility in free countries like the US shows that the class struggle theory is woefully inadequate.
Time would be better spent studying free markets, the law of supply and demand, etc.