I dunno, I played co-op with my friend the other day in the single player demo of the game and it was fine for us. I don't really plan to play co-op with anyone, but I'd be lying if I said that I wouldn't like online co-op.
And I can't believe nobody's pointed this out yet but;
[HEADING=3]you bought the game?[/HEADING] The game doesn't come out until the 22nd in the US, and later for other regions. There's no way, unless you're talking about the single player demo (which I highly doubt [http://www.escapistmagazine.com/forums/read/7.264679-Killzone-3-Leaks-to-Torrent-Sites]), that you would know how co-op works, or how the single player campaign is.
So, if my suspicions are correct, and if they are wrong I do apologize, I'd say you deserve those bad experiences you pirate.
EDIT: And on top of that, you say you haven't played the co-op? Then how do you know about these complaints? Sure, reviewers have pointed out some of these flaws, but you're original post makes it look like you're friggin' offended by the co-op that you haven't played. I smell fishes here.