It's not difference of opinion. It's just totally I'll thought and complete rubbish.
You do not have an even spread of jobs, combined with people aren't all that different. You end up with a similar set of jobs as we do now. But with no free Market there is little chance of swapping to something you enjoy or progressing. Combined with the fact you usually don't have competition. Don't like the "company" you work for, tough luck that's it.
I don't really want to debate the way of actually getting there, but can I just point out Marx and Engels said completely the opposite about communism:
"In communist society, where nobody has one exclusive sphere of activity but each can become accomplished in any branch he wishes, society regulates the general production and thus makes it possible for me to do one thing today and another tomorrow, to hunt in the morning, fish in the afternoon, rear cattle in the evening, criticise after dinner, just as I have a mind, without ever becoming hunter, fisherman, herdsman or critic.
(German Ideology, http://www.marxists.org/archive/marx/works/1845/german-ideology/ch01a.htm)
The whole idea is to actually rotate jobs and not be stuck in one thing all your life where you feel completely alienated. It's becoming the "whole" Renaissance man, if you like.