Sadly, there is no co-op mode for Uncharted 3 's campaign, but it did offer an alternate campaign mode called co-op adventure ...
21hon MSN
Bungie unveils Marathon's first season, confirming that, yes, it'll wipe all your loot and progress
And no, it's not optional.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results