You're absolutely right. In the whole history of socialist and communist endeavour there has never been a very wealthy ruling class sucking up all the wealth, nor have there been famines, shortages and brutal suppression of groups- entire ethnicities- who don't stick closely enough to what the State says.
No, wait, I got that backwards. They ALL ended up with an oppressive bunch of rich 'elites' at the top, with massive nepotism and old-boys-networking. And with the state owning rather more than 99% of the are they're in power over.
Automation wouldn't be bothered with as manpower becomes cheap and expendable. This is why the Soviets beat the Nazis back in WW2- they just threw millions and millions of their soldiers at the enemy, many without training or equipment, and stood another line of troops behind /them/ to stop the first lot retreating.
Or outside wartime, lets use the Great Leap Forwards which killed 45 million people and lead to a few people getting very very rich.
So yeah, lets all be commie bastards and hand the world over to our masters who will treat us like shit and run the country into the ground. Let's do that, because it sounds like such a fucking great idea.