Now that's some stupid nonsense right there...
Leaving aside the fact that I actually like co-op story multiplayer since it's the only kind of multiplayer I'm really interested in, I can't seem to agree with a single one of the issues brought up in the article.
First off, I'd never continue with a co-op savegame on my own, so there's absolutely no need for that silly drop-in/drop-out thing. Second, if my co-op partner (who is my brother more often than not) decides he's got to act like an ass, I don't play with him or chew him out on it next time I see him. Third, I tell people what games they really got to play all the time, and some of them sometimes listen to me. I don't need to drop them in the middle of a story that's already two games old; personally, I'd hate if someone would do that to me. There's not one game with a continuing story out there that really works when begun with the second or third installment.
That said, I already hate myself for the fact that I'll probably find something to like about the game and thus will be encouraging this kind of behaviour from publishers/developers in the future. But if done right I could certainly enjoy the game, while not as Dead Space 3, then probably as "the nice 3rd-person-shooter set in the Dead Space universe".