Co-op playability of game and expansions?

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Good stuff. Thanks for the info guys.

I totally understand that if you have a game designed around AI reacting to just the solo player...that having a second playing who can think for themselves could "break" the game at spots, but game makers could at least issue an unsupported patch that allows coop play with a note to accept the gameplay as is...or if fan mods are possible then a major part of the work would be done for us.

It's funny, coop seems to be gaining ground in recent years as social gaming has become huge, but I think most publishers still think that adding coop just won't translate enough into more sales. Apparently the average Joe and I differ in that respect because it makes a huge difference with me. Even a mediocre game all of a sudden can become a purchase if it has a coop that works well...and as I mentioned earlier, if the game is great to begin with, the coop mode doesn't even have to be that well implemented. One thing's for sure, if you know your game has terrible team AI, you should think hard about implementing coop where such a thing won't even matter.