What is bottom line marxism for you?

Some leftist over here consider our party to not be fully marxist/leftist whatever.

Now, would I say our party (PVDA/PTB) is perfect? No. Would I say it is the furthest an actual marxist party would go in my country? Yes. Is it therefore the best party I could join and become active in? Probably.

I participate in a lot of discussion within the party. I'm openly ML. I have my own views and the official party line doesn't always support it. Nonetheless it is the party I see the most potential in to make actual change.

It made me think. What would you consider the bottom line for joining a party?

Side note: going to sleep now, will read replies next morning.