Cuba has been extremely successful despite the US fucking them over for 60 years. They've sent doctors across the world and even offered to help the US after hurricanes. They also sent anti-imperialist soldiers to African nations to fight for liberation on another continent. Nelson Mandela once famously openly praised Castro and his government for always being there for black South Africans in their struggle to end apartheid. He did so in response to some ignorant dumbass asking why he liked Castro or something like that.

The USSR and China were/are extremely successful. USSR was undermined at every turn by the US and generally western capital, plus some collaboration internally to make very bad economic decisions (moving towards private markets). China... well, look at them. Results speak for themselves.

The DPRK was very successful even post that whole US genociding them ordeal. Under Kim Il-Sung through the 50s until the 90s and post-USSR collapse (a major trading partner) they outpaced the US-propped South Korean state in basically everything. All of this after the US had leveled, effectively, the entire country and placed genocidal sanctions on them. For simply wanting to be a true democracy, btw. There was never any "actual" justification for war in Korea. Well, there was certainly justification for a war to remove the southern puppet(s) but not the war hero Kim who was and is beloved by his people, Chinese people respect him for his personal efforts to help liberate them from Imperial Japanese rule, and he's still seen as a revolutionary hero today to people paying attention.

And killing or "disappearing" reactionaries is overstated by... reactionaries. But, for any amount that does happen, it's generally justified because you can't have an insurgent group of reactionaries, always foreign funded (by the US CIA...), actively undermining you. No government on earth can tolerate such shit. Go start a group with funding from China (good luck with this part) with the explicit goal of destroying whatever western hellscape you inhabit and see how long the government allows you to continue.

No country has achieved full, what the layman would term communism; mostly because Amerika keeps interceding and fucking over millions of people at a time every time someone they were exploiting tries to take the first step of socialism, you absolute rifle. And real talk, how do you suggest dealing with potential reactionaries trying to tear your government down? 'Cause uh, I think if you intend for a hard-leftist political mission to go forward, you're gonna need to remove some fuckin reactionaries. Or do you traffic in morally-pure, bloodless coups? Your forebears didn't.

Every country that goes Marxist Leninist radically improves their living standards, wages, democracy, technological development, ability to defend themselves from imperialism...what countries WEREN'T successful under communism?

The only reason you think otherwise is because you have bought into a narrative fed to you by the communists greatest enemy, the capitalists and fascists.

For starters, political repression is highly overstated by the capitalists and fascists. Why? Well, because those that endure political repression in communist countries are...capitalists and fascists.

Like can you at least read theory before posting reactionary shit?